⬆️ Doctest 2.5.3

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-09-27 18:20:32 +00:00 · 2026-07-08 11:04:03 +02:00
298 changed files with 13536 additions and 47506 deletions
@@ -108,9 +108,7 @@ The tests are located in [`tests/src/unit-*.cpp`](https://github.com/nlohmann/js
 are structured along the features of the library or the nature of the tests. Usually, it should be clear from the
 context which existing file needs to be extended, and only very few cases require creating new test files.

-When fixing a bug, edit `unit-regression3.cpp` and add a section referencing the fixed issue.
-`unit-regression2.cpp` holds the older tests; the two files exist because a single one grew large enough for the
-MinGW linker to fail relocating it, so please keep adding to the smaller file rather than growing the larger one.
+When fixing a bug, edit `unit-regression2.cpp` and add a section referencing the fixed issue.

 #### Exceptions

@@ -158,15 +156,6 @@ make amalgamate
 Running `make amalgamate` will also apply automatic formatting to the source files using
 [`Artistic Style`](https://astyle.sourceforge.net/). This formatting may modify your source files in-place. Be certain to review and commit any changes to avoid unintended formatting diffs in commits.

-If you add, rename, or remove a header in `include/nlohmann`, also regenerate the header list in
-[`BUILD.bazel`](https://github.com/nlohmann/json/blob/develop/BUILD.bazel) (requires CMake) by executing:
-
-```shell
-make BUILD.bazel
-```
-
-The amalgamation check in CI fails if any of these generated files is out of date.
-
 ## Recommended documentation

 - The library’s [README file](https://github.com/nlohmann/json/blob/master/README.md) is an excellent starting point to
@@ -2,7 +2,6 @@

 - [ ] The changes are described in detail, both the what and why.
 - [ ] If applicable, an [existing issue](https://github.com/nlohmann/json/issues) is referenced.
- [ ] If applicable, a fixed [OSS-Fuzz](https://issues.oss-fuzz.com) issue is referenced as `OSS-Fuzz: <id>` (see [fuzz testing](https://github.com/nlohmann/json/blob/develop/tests/fuzzing.md#handling-oss-fuzz-reports)).
 - [ ] The [Code coverage](https://coveralls.io/github/nlohmann/json) remained at 100%. A test case for every new line of code.
 - [ ] If applicable, the [documentation](https://json.nlohmann.me) is updated.
 - [ ] The source code is amalgamated by running `make amalgamate`.
@@ -9,31 +9,12 @@ identified a security vulnerability in this repository, please use the GitHub Se
 Until it is published, this draft security advisory will only be visible to the maintainers of this project. Other
 users and teams may be added once the advisory is created.

-We will send a first response within 14 days, indicating the next steps in handling your report. After the initial
-reply to your report, we will keep you informed of the progress towards a fix and full announcement and may ask for
-additional information or guidance.
+We will send a response indicating the next steps in handling your report. After the initial reply to your report, we
+will keep you informed of the progress towards a fix and full announcement and may ask for additional information or
+guidance.

 For vulnerabilities in third-party dependencies or modules, please report them directly to the respective maintainers.

-## Disclosure and credit
-
-Once a fix is released, we publish the security advisory and list the fixed vulnerability in the release notes. We
-credit the reporter in both, unless they ask not to be named.
-
-## Supported versions
-
-Security fixes are made on the `develop` branch and shipped with the next release. Only the latest release receives
-security fixes; they are not backported to older releases. A release stops receiving security fixes when the next
-release is published, so please update to the latest release to get them.
-
-## Unofficial packages
-
-This project does not publish an official npm package. The npm package
-[`nlohmann-json`](https://www.npmjs.com/package/nlohmann-json) (or similarly named packages) is not maintained or
-endorsed by this project. See the
-[package managers documentation](https://json.nlohmann.me/integration/package_managers/#npm) for supported
-integration options.
-
 ## Additional Resources

 - Explore security-related topics and contribute to tools and projects through
@@ -4,8 +4,6 @@ updates:
    directory: /
    schedule:
      interval: daily
-    cooldown:
-      default-days: 7
    groups:
      codeql-action:
        patterns:
@@ -15,33 +13,23 @@ updates:
    directory: /docs/mkdocs
    schedule:
      interval: daily
-    cooldown:
-      default-days: 7

  - package-ecosystem: pip
    directory: /tools/astyle
    schedule:
      interval: daily
-    cooldown:
-      default-days: 7

  - package-ecosystem: pip
    directory: /tools/generate_natvis
    schedule:
      interval: daily
-    cooldown:
-      default-days: 7

  - package-ecosystem: pip
    directory: /tools/serve_header
    schedule:
      interval: daily
-    cooldown:
-      default-days: 7

  - package-ecosystem: pip
    directory: /cmake/requirements
    schedule:
      interval: daily
-    cooldown:
-      default-days: 7
@@ -29,27 +29,6 @@ labels:
  files:
    - ".github/external_ci/.*"

- label: "CI"
-  files:
-    - ".github/(dependabot|labeler)\\.yml"
-
- label: "aspect: binary formats"
-  files:
-    - "include/nlohmann/detail/input/binary_reader\\.hpp"
-    - "include/nlohmann/detail/output/binary_writer\\.hpp"
-    - "tests/src/unit-(bson|cbor|msgpack|ubjson|bjdata|bon8|binary_formats)"
-    - "tests/src/fuzzer-parse_(bson|cbor|msgpack|ubjson|bjdata|bon8)"
-    - "docs/mkdocs/docs/features/binary_formats/"
-    - "docs/mkdocs/docs/(api/basic_json|examples)/(to|from)_(bson|cbor|msgpack|ubjson|bjdata|bon8)"
-
- label: "aspect: binary formats"
-  title: "(?i)(bson|cbor|msgpack|messagepack|ubjson|bjdata|bon8|binary format)"
-
- label: "python"
-  files:
-    - "\\.py$"
-    - "requirements[^/]*\\.txt$"
-
 - label: "S"
  size-below: 10
 - label: "M"
@@ -3,10 +3,6 @@ name: "Check amalgamation"
 on:
  pull_request:

-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -15,7 +11,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

@@ -38,19 +34,19 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: Checkout pull request
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          path: main
          ref: ${{ github.event.pull_request.head.sha }}
          persist-credentials: false

      - name: Checkout tools
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          path: tools
          ref: develop
@@ -61,31 +57,18 @@ jobs:
          python3 -mvenv venv
          venv/bin/pip3 install -r $MAIN_DIR/tools/astyle/requirements.txt

-      - name: Regenerate amalgamation, formatting, and BUILD.bazel
+      - name: Regenerate amalgamation and formatting
        run: |
          cd $MAIN_DIR

          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json.json -s .
          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json_fwd.json -s .

-          # the header list of the Bazel "json" target must match the files in include/
-          cmake -P cmake/scripts/gen_bazel_build_file.cmake
-
          ${{ github.workspace }}/venv/bin/astyle --project=tools/astyle/.astylerc --suffix=none --quiet \
            $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json_fwd.hpp

-          # fail loudly if a directory is renamed or removed: find would only warn
-          # about the missing path and silently drop its files from the check
-          SOURCE_DIRS="docs/mkdocs/docs/examples include tests"
-          for DIR in $SOURCE_DIRS; do
-            if [ ! -d "$DIR" ]; then
-              echo "::error::source directory '$DIR' does not exist"
-              exit 1
-            fi
-          done
-
          ${{ github.workspace }}/venv/bin/astyle --project=tools/astyle/.astylerc --suffix=none --quiet \
-            $(find $SOURCE_DIRS -type f \( -name '*.hpp' -o -name '*.cpp' -o -name '*.cu' \) -not -path 'tests/thirdparty/*' -not -path 'tests/abi/include/nlohmann/*' | sort)
+            $(find docs/examples include tests -type f \( -name '*.hpp' -o -name '*.cpp' -o -name '*.cu' \) -not -path 'tests/thirdparty/*' -not -path 'tests/abi/include/nlohmann/*' | sort)

      - name: Build patch and check for differences
        id: diff
@@ -94,7 +77,7 @@ jobs:
          mkdir -p ${{ github.workspace }}/patch
          git diff --patch --no-color > ${{ github.workspace }}/patch/amalgamation.patch
          if [ -s ${{ github.workspace }}/patch/amalgamation.patch ]; then
-            echo "The source code has not been amalgamated/formatted correctly or BUILD.bazel is out of date. Diff:"
+            echo "The source code has not been amalgamated/formatted correctly. Diff:"
            cat ${{ github.workspace }}/patch/amalgamation.patch
            echo "has_diff=true" >> "$GITHUB_OUTPUT"
          else
@@ -1,10 +1,6 @@
 name: CIFuzz
 on: [pull_request]

-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -13,7 +9,7 @@ jobs:
    runs-on: ubuntu-22.04
    steps:
    - name: Harden Runner
-      uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+      uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
      with:
        egress-policy: audit

@@ -27,25 +27,25 @@ jobs:

    steps:
    - name: Harden Runner
-      uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+      uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
      with:
        egress-policy: audit

    - name: Checkout repository
-      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      with:
        persist-credentials: false

    # Initializes the CodeQL tools for scanning.
    - name: Initialize CodeQL
-      uses: github/codeql-action/init@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
+      uses: github/codeql-action/init@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
      with:
        languages: c-cpp

    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
    # If this step fails, then you should remove it and run the build manually (see below)
    - name: Autobuild
-      uses: github/codeql-action/autobuild@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
+      uses: github/codeql-action/autobuild@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3

    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
+      uses: github/codeql-action/analyze@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
@@ -19,7 +19,7 @@ jobs:
      pull-requests: write
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

@@ -95,13 +95,13 @@ jobs:
              issue_number: issue_number,
              owner: context.repo.owner,
              repo: context.repo.repo,
-              body: '## 🔴 Amalgamation check failed! 🔴\nThe source code has not been amalgamated and/or formatted correctly, or `BUILD.bazel` is out of date.'
+              body: '## 🔴 Amalgamation check failed! 🔴\nThe source code has not been amalgamated and/or formatted correctly.'
                    + (hasPatch ? '\n\n📎 A ready-to-apply patch is attached to the [failed workflow run](' + runUrl + ') as the `amalgamation-patch` artifact.'
                                  + ' Download it, then apply it locally from the repository root with:'
                                  + '\n\n```shell\ngit apply amalgamation.patch\n```\n\n'
                                  + 'This does not require installing astyle yourself.'
                                : '')
                    + (first ? '\n\n@' + author + ' Please read and follow the [Contribution Guidelines]'
-                               + '(https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#amalgamate-the-source-code).'
+                               + '(https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).'
                             : '')
              })
@@ -9,10 +9,6 @@
 name: 'Dependency Review'
 on: [pull_request]

-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -21,12 +17,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: 'Checkout Repository'
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: 'Dependency Review'
@@ -5,10 +5,6 @@

 name: flawfinder

-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -31,12 +27,12 @@ jobs:
      security-events: write
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: Checkout code
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

@@ -47,6 +43,6 @@ jobs:
          output: 'flawfinder_results.sarif'

      - name: Upload analysis results to GitHub Security tab
-        uses: github/codeql-action/upload-sarif@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
+        uses: github/codeql-action/upload-sarif@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
        with:
          sarif_file: ${{github.workspace}}/flawfinder_results.sarif
@@ -4,12 +4,6 @@ on:
  pull_request_target:
    types: [opened, synchronize]

-# pull_request_target runs on the base branch, so github.ref would put all pull
-# requests into one group; group by pull request number instead
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -23,7 +17,7 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

@@ -26,7 +26,7 @@ jobs:
      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Run CMake
@@ -45,7 +45,7 @@ jobs:
      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Run CMake
@@ -62,7 +62,7 @@ jobs:
        standard: [11, 14, 17, 20, 23, 26]

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Run CMake
@@ -7,6 +7,7 @@ on:
      - develop
    paths:
      - docs/mkdocs/**
+      - docs/examples/**
  workflow_dispatch:

 # we don't want to have concurrent jobs, and we don't want to cancel running jobs to avoid broken publications
@@ -26,11 +27,11 @@ jobs:
    runs-on: ubuntu-22.04
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

      - name: Install virtual environment
        run: make install_venv -C docs/mkdocs
@@ -14,10 +14,6 @@ on:
  push:
    branches: ["develop"]

-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -40,17 +36,17 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: "Checkout code"
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

      - name: "Run analysis"
-        uses: ossf/scorecard-action@2d1146689b8cda280b9bc96326124645441f03bc # v2.4.4
+        uses: ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a # v2.4.3
        with:
          results_file: results.sarif
          results_format: sarif
@@ -80,6 +76,6 @@ jobs:

      # Upload the results to GitHub's code scanning dashboard.
      - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
+        uses: github/codeql-action/upload-sarif@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
        with:
          sarif_file: results.sarif
@@ -19,10 +19,6 @@ on:
  schedule:
    - cron: '23 2 * * 4'

-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
-  cancel-in-progress: true
-
 permissions:
  contents: read

@@ -36,12 +32,12 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      # Checkout project source
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

@@ -53,7 +49,7 @@ jobs:
      # SEMGREP_APP_TOKEN is still passed through so registry auth works if a
      # token is ever added.
      - name: Install Semgrep
-        run: python3 -m pip install --user semgrep==1.168.0
+        run: python3 -m pip install --user semgrep

      # `semgrep scan --sarif` always exits 0 even with findings; continue-on-error
      # is a safety net so the SARIF upload still runs if the scan itself errors.
@@ -65,7 +61,7 @@ jobs:

      # Upload SARIF file generated in previous step
      - name: Upload SARIF file
-        uses: github/codeql-action/upload-sarif@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
+        uses: github/codeql-action/upload-sarif@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
        with:
          sarif_file: semgrep.sarif
        if: always()
@@ -16,11 +16,11 @@ jobs:

    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

-      - uses: actions/stale@4391f3da665fdf50b6810c1a66712fb9ba21aa93 # v11.0.0
+      - uses: actions/stale@eb5cf3af3ac0a1aa4c9c45633dd1ae542a27a899 # v10.3.0
        with:
          stale-issue-label: 'state: stale'
          stale-pr-label: 'state: stale'
@@ -21,11 +21,11 @@ jobs:
    runs-on: ubuntu-latest
    container: gcc:latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -33,21 +33,11 @@ jobs:

  ci_infer:
    runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
    steps:
-      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
-        with:
-          egress-policy: audit
-
-      - name: Install Infer
-        run: |
-          wget -q -O - "https://github.com/facebook/infer/releases/download/v1.3.0/infer-linux-x86_64-v1.3.0.tar.xz" | sudo tar -C /opt -xJ
-          sudo ln -s /opt/infer-linux-x86_64-v1.3.0/bin/infer /usr/local/bin/infer
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
-      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -60,17 +50,17 @@ jobs:
        target: [ci_test_amalgamation, ci_test_single_header, ci_cppcheck, ci_cpplint, ci_reproducible_tests, ci_non_git_tests, ci_offline_testdata, ci_reuse_compliance, ci_test_valgrind]
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: Install Valgrind
        run: sudo apt-get update ; sudo apt-get install -y valgrind
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -85,11 +75,11 @@ jobs:
    steps:
      - name: Install git, clang-tools, iwyu (ci_single_binaries), and unzip
        run: apt-get update ; apt-get install -y git clang-tools iwyu unzip
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -100,15 +90,15 @@ jobs:
    container: ubuntu:focal
    strategy:
      matrix:
-        target: [ci_cmake_flags, ci_test_diagnostics, ci_test_diagnostic_positions, ci_test_noexceptions, ci_test_noimplicitconversions, ci_test_legacycomparison, ci_test_noglobaludls, ci_test_disableenumserialization, ci_test_skiplibraryversioncheck, ci_test_simdutf, ci_test_strict_nul_handling, ci_test_no_thread_local]
+        target: [ci_cmake_flags, ci_test_diagnostics, ci_test_diagnostic_positions, ci_test_noexceptions, ci_test_noimplicitconversions, ci_test_legacycomparison, ci_test_noglobaludls]
    steps:
      - name: Install build-essential
        run: apt-get update ; apt-get install -y build-essential unzip wget git libssl-dev
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -118,11 +108,11 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Install dependencies and de_DE locale
@@ -142,7 +132,7 @@ jobs:
          name: code-coverage-report
          path: ${{ github.workspace }}/build/html
      - name: Publish report to Coveralls
-        uses: coverallsapp/github-action@8d6379e14d29928660c4ba802d8e85393440b329 # v2.3.8
+        uses: coverallsapp/github-action@5cbfd81b66ca5d10c19b062c04de0199c215fb6e # v2.3.7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          path-to-lcov: ${{ github.workspace }}/build/json.info.filtered.noexcept
@@ -153,38 +143,11 @@ jobs:
    strategy:
      matrix:
        compiler: ['4.8', '4.9', '5', '6']
-    # official gcc:4.8/4.9/5/6 images fail to check out code (too old for
-    # actions/checkout); install the old compilers on top of official ubuntu:20.04
-    # instead, mirroring what the (now retired) custom json-ci image did.
-    container: ubuntu:20.04
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
    steps:
-      - name: Install g++-${{ matrix.compiler }}
-        run: |
-          export DEBIAN_FRONTEND=noninteractive
-          apt-get update
-          apt-get install -y --no-install-recommends software-properties-common ca-certificates gnupg make git
-          # add-apt-repository resolves the PPA through the Launchpad API,
-          # which intermittently times out or fails the team lookup (the plain
-          # "deb ..." sources below never hit Launchpad and never flake).
-          # Retry with backoff so a transient Launchpad blip does not fail CI.
-          for attempt in 1 2 3 4 5; do
-            add-apt-repository -y ppa:ubuntu-toolchain-r/test && break
-            echo "::warning::add-apt-repository ppa:ubuntu-toolchain-r/test failed (attempt ${attempt}/5); retrying"
-            sleep $((attempt * 10))
-          done
-          apt-add-repository -y "deb http://archive.ubuntu.com/ubuntu/ bionic main"
-          apt-add-repository -y "deb http://archive.ubuntu.com/ubuntu/ bionic universe"
-          apt-add-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial main"
-          apt-add-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial universe"
-          apt-add-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial-updates main"
-          apt-add-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial-updates universe"
-          apt-get update
-          apt-get install -y --no-install-recommends g++-${{ matrix.compiler }}
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
-      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
      - name: Run CMake
        run: CXX=g++-${{ matrix.compiler }} cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -198,11 +161,11 @@ jobs:
        compiler: ['7', '8', '9', '10', '11', '12', '13', '14', '15', 'latest']
    container: gcc:${{ matrix.compiler }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -212,14 +175,14 @@ jobs:
    runs-on: ubuntu-latest
    strategy:
      matrix:
-        compiler: ['3.4', '3.5', '3.6', '3.7', '3.8', '3.9', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15-bullseye', '16', '17', '18', '19', '20', '21', '22', 'latest']
+        compiler: ['3.4', '3.5', '3.6', '3.7', '3.8', '3.9', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15-bullseye', '16', '17', '18', '19', '20', 'latest']
    container: silkeh/clang:${{ matrix.compiler }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Set env FORCE_STDCPPFS_FLAG for clang 7 / 8 / 9 / 10
        run: echo "JSON_FORCED_GLOBAL_COMPILE_OPTIONS=-DJSON_HAS_FILESYSTEM=0;-DJSON_HAS_EXPERIMENTAL_FILESYSTEM=0" >> "$GITHUB_ENV"
        if: ${{ matrix.compiler == '7' || matrix.compiler == '8' || matrix.compiler == '9' || matrix.compiler == '10' }}
@@ -235,11 +198,11 @@ jobs:
      matrix:
        standard: [11, 14, 17, 20, 23, 26]
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -255,11 +218,11 @@ jobs:
    steps:
      - name: Install git and unzip
        run: apt-get update ; apt-get install -y git unzip
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build with libc++
@@ -271,22 +234,11 @@ jobs:

  ci_cuda_example:
    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        # 11.8.0: newest pre-C++20 CUDA release, exercises the C++17 fallback
-        # path (tests/cuda_example/CMakeLists.txt picks the standard per nvcc
-        # version); 12.1.1: permanent regression guard for #3907 (nvcc 12.0/12.1
-        # choke on enable_borrowed_range at C++20, fixed in 12.2); 12.6.3: recent
-        # CUDA/C++20 coverage.
-        cuda: ['11.8.0', '12.1.1', '12.6.3']
-    container: nvidia/cuda:${{ matrix.cuda }}-devel-ubuntu22.04
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
-      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -299,14 +251,14 @@ jobs:
    runs-on: ubuntu-latest
    container: ${{ matrix.container }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      # The module test uses `import std;`, which needs CMake's experimental
      # import-std support. Its opt-in token is CMake-version-specific, so pin
      # CMake to the version whose token is set in tests/module_cpp20/CMakeLists.txt.
      - name: Get pinned CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
        with:
          cmakeVersion: 4.3.4
      # Clang: the std library module is provided by libc++ (the image's libstdc++
@@ -324,30 +276,25 @@ jobs:

  ci_icpc:
    runs-on: ubuntu-latest
-    # Intel discontinued the classic icc/icpc compiler in oneAPI 2024.0; this is
-    # Intel's own last officially published image that still includes it.
-    container: intel/oneapi-hpckit:2023.2.1-devel-ubuntu22.04
+    container: ghcr.io/nlohmann/json-ci:v2.2.0
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
-      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
-        # No need to source setvars.sh here: unlike the old custom image, this
-        # official image already has the oneAPI environment (icc/icpc on PATH)
-        # baked in, and re-sourcing it fails with "already been run" (exit 3).
-        run: cmake --build build --target ci_icpc
+        run: |
+          . /opt/intel/oneapi/setvars.sh
+          cmake --build build --target ci_icpc

  ci_icpx:
    runs-on: ubuntu-latest
    container: intel/oneapi-hpckit:latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -357,9 +304,9 @@ jobs:
    runs-on: ubuntu-latest
    container: nvcr.io/nvidia/nvhpc:25.5-devel-cuda12.9-ubuntu22.04
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DJSON_CI=On
      - name: Build
@@ -369,17 +316,17 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: Install emscripten
        uses: mymindstorm/setup-emsdk@4528d102f7230f0e7b276855c01ea1159be0e984 # v16
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Run CMake
        run: cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -GNinja
      - name: Build
@@ -392,11 +339,11 @@ jobs:
        target: [ci_test_examples, ci_test_build_documentation]
    steps:
      - name: Harden Runner
-        uses: step-security/harden-runner@e14015d583714f6e62063499dc959a02595150a1 # v2.21.1
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Run CMake
@@ -24,7 +24,7 @@ jobs:
        architecture: [x64, x86]

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Set up MinGW
@@ -49,7 +49,7 @@ jobs:
    runs-on: windows-2022

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Set extra CXX_FLAGS for latest std_version
@@ -86,17 +86,15 @@ jobs:
    runs-on: windows-2025

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
      - name: Set extra CXX_FLAGS for latest std_version
-        # /wd5285 silences C5285 emitted by the bundled third-party doctest.h, which
-        # specializes std::tuple (newly diagnosed by the VS2026 v145 toolset)
        run: |
          if [ "${{ matrix.std_version }}" = "latest" ]; then
-            echo "flags=/permissive- /std:c++latest /utf-8 /W4 /WX /wd5285" >> $GITHUB_ENV
+            echo "flags=/permissive- /std:c++latest /utf-8 /W4 /WX" >> $GITHUB_ENV
          else
-            echo "flags=/W4 /WX /wd5285" >> $GITHUB_ENV
+            echo "flags=/W4 /WX" >> $GITHUB_ENV
          fi
        shell: bash
      - name: Run CMake (Release)
@@ -122,13 +120,13 @@ jobs:
    runs-on: windows-11-arm

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
      - name: Run CMake (Release)
-        run: cmake -S . -B build -G "Visual Studio 18 2026" -A ARM64 -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/W4 /WX"
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ARM64 -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS="/W4 /WX"
        if: matrix.build_type == 'Release'
        shell: pwsh
      - name: Run CMake (Debug)
-        run: cmake -S . -B build -G "Visual Studio 18 2026" -A ARM64 -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="/W4 /WX"
+        run: cmake -S . -B build -G "Visual Studio 17 2022" -A ARM64 -DJSON_BuildTests=On -DJSON_FastTests=ON -DCMAKE_CXX_FLAGS="/W4 /WX"
        if: matrix.build_type == 'Debug'
        shell: pwsh
      - name: Build
@@ -143,7 +141,7 @@ jobs:
        version: [11.0.1, 12.0.1, 13.0.1, 14.0.6, 15.0.7, 16.0.6, 18.1.8, 19.1.7, 20.1.8]

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Install Clang
@@ -153,20 +151,10 @@ jobs:
        with:
          platform: x64
          version: 12.2.0 # https://github.com/egor-tensin/setup-mingw/issues/14
-      # CMAKE_CXX_FLAGS_DEBUG is overridden to drop the default -g: linking
-      # test-regression2_cpp20 intermittently fails with "relocation truncated
-      # to fit: IMAGE_REL_AMD64_SECREL against `.debug_line'" because the
-      # MinGW linker cannot relocate the debug sections this test produces.
-      # The tests are only built and run here, so the debug info is not used.
-      # Do not add -O1 here to shrink the objects further: it does make them
-      # link, but the binaries clang 11.0.1 and clang 18.1.8 then produce crash
-      # before doctest prints its first line - 39 of 102 tests on clang 18.
-      # Keep the objects small by splitting the test files instead.
      - name: Run CMake
        run: cmake -S . -B build ^
             -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" ^
             -DCMAKE_CXX_FLAGS="--target=x86_64-w64-mingw32 -stdlib=libstdc++ -pthread" ^
-             -DCMAKE_CXX_FLAGS_DEBUG="-g0" ^
             -DCMAKE_EXE_LINKER_FLAGS="-lwinpthread" ^
             -G"MinGW Makefiles" ^
             -DCMAKE_BUILD_TYPE=Debug ^
@@ -183,7 +171,7 @@ jobs:
        architecture: [Win32, x64]

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      - name: Run CMake
@@ -196,14 +184,14 @@ jobs:
  ci_module_cpp20:
    runs-on: windows-2022
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
      # The module test uses `import std;`, which needs CMake's experimental
      # import-std support. Its opt-in token is CMake-version-specific, so pin
      # CMake to the version whose token is set in tests/module_cpp20/CMakeLists.txt.
      - name: Get pinned CMake and ninja
-        uses: lukka/get-cmake@fffaaafeea488556c2c12dad60690008bc1caacb # v4.4.2
+        uses: lukka/get-cmake@f5b8fbb4d77cec1acc5a5f9f0df4beffaf5d98d9 # v4.3.4
        with:
          cmakeVersion: 4.3.4
      - name: Run CMake (Debug)
@@ -30,10 +30,8 @@ cc_library(
        "include/nlohmann/detail/input/input_adapters.hpp",
        "include/nlohmann/detail/input/json_sax.hpp",
        "include/nlohmann/detail/input/lexer.hpp",
-        "include/nlohmann/detail/input/number_parse.hpp",
        "include/nlohmann/detail/input/parser.hpp",
        "include/nlohmann/detail/input/position_t.hpp",
-        "include/nlohmann/detail/input/string_scan.hpp",
        "include/nlohmann/detail/iterators/internal_iterator.hpp",
        "include/nlohmann/detail/iterators/iter_impl.hpp",
        "include/nlohmann/detail/iterators/iteration_proxy.hpp",
@@ -51,14 +49,12 @@ cc_library(
        "include/nlohmann/detail/meta/detected.hpp",
        "include/nlohmann/detail/meta/identity_tag.hpp",
        "include/nlohmann/detail/meta/is_sax.hpp",
-        "include/nlohmann/detail/meta/logic.hpp",
        "include/nlohmann/detail/meta/std_fs.hpp",
        "include/nlohmann/detail/meta/type_traits.hpp",
        "include/nlohmann/detail/meta/void_t.hpp",
        "include/nlohmann/detail/output/binary_writer.hpp",
        "include/nlohmann/detail/output/output_adapters.hpp",
        "include/nlohmann/detail/output/serializer.hpp",
-        "include/nlohmann/detail/recursion_depth_limit.hpp",
        "include/nlohmann/detail/string_concat.hpp",
        "include/nlohmann/detail/string_escape.hpp",
        "include/nlohmann/detail/string_utils.hpp",
@@ -71,6 +67,7 @@ cc_library(
    ],
    includes = ["include"],
    visibility = ["//visibility:public"],
+    alwayslink = True,
 )

 cc_library(
@@ -59,7 +59,6 @@ option(JSON_LegacyDiscardedValueComparison "Enable legacy discarded value compar
 option(JSON_Install                        "Install CMake targets during install step." ${MAIN_PROJECT})
 option(JSON_MultipleHeaders                "Use non-amalgamated version of the library." ON)
 option(JSON_SystemInclude                  "Include as system headers (skip for clang-tidy)." OFF)
-option(JSON_StrictNulHandling              "Build with strict NUL-byte handling enabled." OFF)

 if (JSON_CI)
    include(ci)
@@ -109,10 +108,6 @@ if (JSON_Diagnostics)
    message(STATUS "Diagnostics enabled (JSON_DIAGNOSTICS=1)")
 endif()

-if (JSON_StrictNulHandling)
-    message(STATUS "Strict NUL-byte handling enabled (JSON_STRICT_NUL_HANDLING=1)")
-endif()
-
 if (JSON_Diagnostic_Positions)
    message(STATUS "Diagnostic positions enabled (JSON_DIAGNOSTIC_POSITIONS=1)")
 endif()
@@ -146,7 +141,6 @@ target_compile_definitions(
    $<$<BOOL:${JSON_Diagnostics}>:JSON_DIAGNOSTICS=1>
    $<$<BOOL:${JSON_Diagnostic_Positions}>:JSON_DIAGNOSTIC_POSITIONS=1>
    $<$<BOOL:${JSON_LegacyDiscardedValueComparison}>:JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON=1>
-    $<$<BOOL:${JSON_StrictNulHandling}>:JSON_STRICT_NUL_HANDLING=1>
 )

 target_include_directories(
@@ -250,16 +250,12 @@ Further documentation:

 ### `BUILD.bazel`

-The build definition for [Bazel](https://bazel.build). The file is generated by
-`cmake/scripts/gen_bazel_build_file.cmake`, which derives the header list from the files in `include`; change the
-script rather than editing the file by hand. The file can be updated by calling
+The file can be updated by calling

 ```shell
 make BUILD.bazel
 ```

-The "Check amalgamation" workflow fails if the file is out of date.
-
 ### `meson.build`

 The build definition for the [Meson](https://mesonbuild.com) build system.
@@ -1,4 +1,4 @@
-.PHONY: pretty clean ChangeLog.md release update_hedley update_hedley_undef BUILD.bazel
+.PHONY: pretty clean ChangeLog.md release

 ##########################################################################
 # configuration
@@ -30,21 +30,17 @@ AMALGAMATED_FWD_FILE=single_include/nlohmann/json_fwd.hpp
 # main target
 all:
 	@echo "amalgamate - amalgamate files single_include/nlohmann/json{,_fwd}.hpp from the include/nlohmann sources"
-	@echo "BUILD.bazel - regenerate the Bazel BUILD file from the include/nlohmann sources"
 	@echo "ChangeLog.md - generate ChangeLog file"
-	@echo "check-amalgamation - check whether sources have been amalgamated and BUILD.bazel is up to date"
+	@echo "check-amalgamation - check whether sources have been amalgamated"
 	@echo "clean - remove built files"
 	@echo "doctest - compile example files and check their output"
 	@echo "fuzz_testing - prepare fuzz testing of the JSON parser"
-	@echo "fuzz_testing_bon8 - prepare fuzz testing of the BON8 parser"
 	@echo "fuzz_testing_bson - prepare fuzz testing of the BSON parser"
 	@echo "fuzz_testing_cbor - prepare fuzz testing of the CBOR parser"
 	@echo "fuzz_testing_msgpack - prepare fuzz testing of the MessagePack parser"
 	@echo "fuzz_testing_ubjson - prepare fuzz testing of the UBJSON parser"
 	@echo "pretty - beautify code with Artistic Style"
 	@echo "run_benchmarks - build and run benchmarks"
-	@echo "update_hedley - download Hedley and regenerate hedley.hpp / hedley_undef.hpp"
-	@echo "update_hedley_undef - rebuild hedley_undef.hpp from the JSON_HEDLEY_* #define names in hedley.hpp"


 ##########################################################################
@@ -72,14 +68,6 @@ fuzz_testing:
 	find tests/data/json_tests -size -5k -name *json | xargs -I{} cp "{}" fuzz-testing/testcases
 	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"

-fuzz_testing_bon8:
-	rm -fr fuzz-testing
-	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
-	$(MAKE) parse_bon8_fuzzer -C tests CXX=afl-clang++
-	mv tests/parse_bon8_fuzzer fuzz-testing/fuzzer
-	find tests/data -size -5k -name *.bon8 | xargs -I{} cp "{}" fuzz-testing/testcases
-	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
-
 fuzz_testing_bson:
 	rm -fr fuzz-testing
 	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
@@ -182,13 +170,8 @@ check-amalgamation:
 	@diff $(AMALGAMATED_FWD_FILE) $(AMALGAMATED_FWD_FILE)~ || (echo "===================================================================\n  Amalgamation required! Please read the contribution guidelines\n  in file .github/CONTRIBUTING.md.\n===================================================================" ; mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE) ; false)
 	@mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE)
 	@mv $(AMALGAMATED_FWD_FILE)~ $(AMALGAMATED_FWD_FILE)
-	@mv BUILD.bazel BUILD.bazel~
-	@$(MAKE) BUILD.bazel
-	@diff BUILD.bazel BUILD.bazel~ || (echo "===================================================================\n  BUILD.bazel is out of date! Please run 'make BUILD.bazel'.\n===================================================================" ; mv BUILD.bazel~ BUILD.bazel ; false)
-	@mv BUILD.bazel~ BUILD.bazel

-# generate the Bazel BUILD file; phony, because a removed header would not trigger a rebuild
-BUILD.bazel:
+BUILD.bazel: $(SRCS)
 	cmake -P cmake/scripts/gen_bazel_build_file.cmake

 ##########################################################################
@@ -258,24 +241,11 @@ update_hedley:
 	rm -f include/nlohmann/thirdparty/hedley/hedley.hpp include/nlohmann/thirdparty/hedley/hedley_undef.hpp
 	curl https://raw.githubusercontent.com/nemequ/hedley/master/hedley.h -o include/nlohmann/thirdparty/hedley/hedley.hpp
 	$(SED) -i 's/HEDLEY_/JSON_HEDLEY_/g' include/nlohmann/thirdparty/hedley/hedley.hpp
+	grep "[[:blank:]]*#[[:blank:]]*undef" include/nlohmann/thirdparty/hedley/hedley.hpp | grep -v "__" | sort | uniq | $(SED) 's/ //g' | $(SED) 's/undef/undef /g' > include/nlohmann/thirdparty/hedley/hedley_undef.hpp
 	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley.hpp
-	$(MAKE) update_hedley_undef
+	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley_undef.hpp
 	$(MAKE) amalgamate

-# Rebuild hedley_undef.hpp from every JSON_HEDLEY_* name that hedley.hpp
-# #defines. Hedley does not #undef all of its public macros internally (see
-# #5408), so grepping those #undef lines misses names such as
-# JSON_HEDLEY_PRAGMA. cmake/scripts/gen_hedley_undef_check.cmake is the
-# single source of truth for this extraction (tests/CMakeLists.txt uses the
-# same script, in MODE=checks, to generate the matching leak-check test), so
-# the vendored header, the generated #undef list, and the regression test
-# cannot drift apart.
-update_hedley_undef:
-	cmake -DHEDLEY_HPP=include/nlohmann/thirdparty/hedley/hedley.hpp \
-	      -DOUTPUT=include/nlohmann/thirdparty/hedley/hedley_undef.hpp \
-	      -DMODE=undef \
-	      -P cmake/scripts/gen_hedley_undef_check.cmake
-
 ##########################################################################
 # serve_header.py
 ##########################################################################
@@ -17,7 +17,7 @@
 [![GitHub Downloads](https://img.shields.io/github/downloads/nlohmann/json/total)](https://github.com/nlohmann/json/releases)
 [![GitHub Issues](https://img.shields.io/github/issues/nlohmann/json.svg)](https://github.com/nlohmann/json/issues)
 [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/nlohmann/json.svg)](https://isitmaintained.com/project/nlohmann/json "Average time to resolve an issue")
-[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/289/badge)](https://www.bestpractices.dev/projects/289)
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/289/badge)](https://bestpractices.coreinfrastructure.org/projects/289)
 [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/nlohmann/json/badge)](https://scorecard.dev/viewer/?uri=github.com/nlohmann/json)
 [![Backup Status](https://app.cloudback.it/badge/nlohmann/json)](https://cloudback.it)
 [![GitHub Sponsors](https://img.shields.io/badge/GitHub-Sponsors-ff69b4)](https://github.com/sponsors/nlohmann)
@@ -40,9 +40,8 @@
  - [Implicit conversions](#implicit-conversions)
  - [Conversions to/from arbitrary types](#arbitrary-types-conversions)
  - [Specializing enum conversion](#specializing-enum-conversion)
-  - [Binary formats (BSON, CBOR, MessagePack, UBJSON, BJData, and BON8)](#binary-formats-bson-cbor-messagepack-ubjson-bjdata-and-bon8)
+  - [Binary formats (BSON, CBOR, MessagePack, UBJSON, and BJData)](#binary-formats-bson-cbor-messagepack-ubjson-and-bjdata)
 - [Customers](#customers)
- [Ecosystem](#ecosystem)
 - [Supported compilers](#supported-compilers)
 - [Integration](#integration)
  - [CMake](#cmake)
@@ -63,7 +62,7 @@ There are myriads of [JSON](https://json.org) libraries out there, and each may

 - **Trivial integration**. Our whole code consists of a single header file [`json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp). That's it. No library, no subproject, no dependencies, no complex build system. The class is written in vanilla C++11. All in all, everything should require no adjustment of your compiler flags or project settings. The library is also included in all popular [package managers](https://json.nlohmann.me/integration/package_managers/).

- **Serious testing**. Our code is heavily [unit-tested](https://github.com/nlohmann/json/tree/develop/tests/src) and covers [100%](https://coveralls.io/r/nlohmann/json) of the code, including all exceptional behavior. Furthermore, we checked with [Valgrind](https://valgrind.org) and the [Clang Sanitizers](https://clang.llvm.org/docs/index.html) that there are no memory leaks. [Google OSS-Fuzz](https://github.com/google/oss-fuzz/tree/master/projects/json) additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the [OpenSSF Best Practices](https://www.bestpractices.dev/projects/289). See the [quality assurance](https://json.nlohmann.me/community/quality_assurance) overview documentation.
+- **Serious testing**. Our code is heavily [unit-tested](https://github.com/nlohmann/json/tree/develop/tests/src) and covers [100%](https://coveralls.io/r/nlohmann/json) of the code, including all exceptional behavior. Furthermore, we checked with [Valgrind](https://valgrind.org) and the [Clang Sanitizers](https://clang.llvm.org/docs/index.html) that there are no memory leaks. [Google OSS-Fuzz](https://github.com/google/oss-fuzz/tree/master/projects/json) additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. To maintain high quality, the project is following the [Core Infrastructure Initiative (CII) best practices](https://bestpractices.coreinfrastructure.org/projects/289). See the [quality assurance](https://json.nlohmann.me/community/quality_assurance) overview documentation.

 Other aspects were not so important to us:

@@ -91,6 +90,7 @@ You can sponsor this library at [GitHub Sponsors](https://github.com/sponsors/nl
 - [Steve Sperandeo](https://github.com/homer6)
 - [Robert Jefe Lindstädt](https://github.com/eljefedelrodeodeljefe)
 - [Steve Wagner](https://github.com/ciroque)
+- [Lion Yang](https://github.com/LionNatsu)

 ### Further support

@@ -128,7 +128,7 @@ There is also a [**docset**](https://github.com/Kapeli/Dash-User-Contributions/t
 - **JSON Pointer functions**: [flatten](https://json.nlohmann.me/api/basic_json/flatten), [unflatten](https://json.nlohmann.me/api/basic_json/unflatten)
 - **JSON Patch functions**: [patch](https://json.nlohmann.me/api/basic_json/patch), [patch_inplace](https://json.nlohmann.me/api/basic_json/patch_inplace), [diff](https://json.nlohmann.me/api/basic_json/diff), [merge_patch](https://json.nlohmann.me/api/basic_json/merge_patch)
 - **Static functions**: [meta](https://json.nlohmann.me/api/basic_json/meta), [get_allocator](https://json.nlohmann.me/api/basic_json/get_allocator)
- **Binary formats**: [from_bjdata](https://json.nlohmann.me/api/basic_json/from_bjdata), [from_bon8](https://json.nlohmann.me/api/basic_json/from_bon8), [from_bson](https://json.nlohmann.me/api/basic_json/from_bson), [from_cbor](https://json.nlohmann.me/api/basic_json/from_cbor), [from_msgpack](https://json.nlohmann.me/api/basic_json/from_msgpack), [from_ubjson](https://json.nlohmann.me/api/basic_json/from_ubjson), [to_bjdata](https://json.nlohmann.me/api/basic_json/to_bjdata), [to_bon8](https://json.nlohmann.me/api/basic_json/to_bon8), [to_bson](https://json.nlohmann.me/api/basic_json/to_bson), [to_cbor](https://json.nlohmann.me/api/basic_json/to_cbor), [to_msgpack](https://json.nlohmann.me/api/basic_json/to_msgpack), [to_ubjson](https://json.nlohmann.me/api/basic_json/to_ubjson)
+- **Binary formats**: [from_bjdata](https://json.nlohmann.me/api/basic_json/from_bjdata), [from_bson](https://json.nlohmann.me/api/basic_json/from_bson), [from_cbor](https://json.nlohmann.me/api/basic_json/from_cbor), [from_msgpack](https://json.nlohmann.me/api/basic_json/from_msgpack), [from_ubjson](https://json.nlohmann.me/api/basic_json/from_ubjson), [to_bjdata](https://json.nlohmann.me/api/basic_json/to_bjdata), [to_bson](https://json.nlohmann.me/api/basic_json/to_bson), [to_cbor](https://json.nlohmann.me/api/basic_json/to_cbor), [to_msgpack](https://json.nlohmann.me/api/basic_json/to_msgpack), [to_ubjson](https://json.nlohmann.me/api/basic_json/to_ubjson)
 - **Non-member functions**: [operator<<](https://json.nlohmann.me/api/operator_ltlt/), [operator>>](https://json.nlohmann.me/api/operator_gtgt/), [to_string](https://json.nlohmann.me/api/basic_json/to_string)
 - **Literals**: [operator""_json](https://json.nlohmann.me/api/operator_literal_json)
 - **Helper classes**: [std::hash&lt;basic_json&gt;](https://json.nlohmann.me/api/basic_json/std_hash), [std::swap&lt;basic_json&gt;](https://json.nlohmann.me/api/basic_json/std_swap)
@@ -1110,9 +1110,9 @@ Other Important points:
 - When using `get<ENUM_TYPE>()`, undefined JSON values will default to the first pair specified in your map. Select this default pair carefully. If you desire an exception in this circumstance use `NLOHMANN_JSON_SERIALIZE_ENUM_STRICT()` which behaves identically except for throwing an exception on unrecognized values.
 - If an enum or JSON value is specified more than once in your map, the first matching occurrence from the top of the map will be returned when converting to or from JSON.

-### Binary formats (BSON, CBOR, MessagePack, UBJSON, BJData, and BON8)
+### Binary formats (BSON, CBOR, MessagePack, UBJSON, and BJData)

-Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance over a network. Hence, the library supports [BSON](https://bsonspec.org) (Binary JSON), [CBOR](https://cbor.io) (Concise Binary Object Representation), [MessagePack](https://msgpack.org), [UBJSON](https://ubjson.org) (Universal Binary JSON Specification), [BJData](https://neurojson.org/bjdata) (Binary JData), and [BON8](https://github.com/hikoworks/hikogui/blob/main/docs/BON8.md) (Binary Object Notation 8) to efficiently encode JSON values to byte vectors and to decode such vectors.
+Though JSON is a ubiquitous data format, it is not a very compact format suitable for data exchange, for instance over a network. Hence, the library supports [BSON](https://bsonspec.org) (Binary JSON), [CBOR](https://cbor.io) (Concise Binary Object Representation), [MessagePack](https://msgpack.org), [UBJSON](https://ubjson.org) (Universal Binary JSON Specification) and [BJData](https://neurojson.org/bjdata) (Binary JData) to efficiently encode JSON values to byte vectors and to decode such vectors.

 ```cpp
 // create a JSON value
@@ -1149,14 +1149,6 @@ std::vector<std::uint8_t> v_ubjson = json::to_ubjson(j);

 // roundtrip
 json j_from_ubjson = json::from_ubjson(v_ubjson);
-
-// serialize to BON8
-std::vector<std::uint8_t> v_bon8 = json::to_bon8(j);
-
-// 0x88, 0x63, 0x6F, 0x6D, 0x70, 0x61, 0x63, 0x74, 0xF9, 0x73, 0x63, 0x68, 0x65, 0x6D, 0x61, 0x90
-
-// roundtrip
-json j_from_bon8 = json::from_bon8(v_bon8);
 ```

 The library also supports binary types from BSON, CBOR (byte strings), and MessagePack (bin, ext, fixext). They are stored by default as `std::vector<std::uint8_t>` to be processed outside the library.
@@ -1195,11 +1187,6 @@ The library is used in multiple projects, applications, operating systems, etc.

 [![logos of customers using the library](docs/mkdocs/docs/images/customers.png)](https://json.nlohmann.me/home/customers/)

-## Ecosystem
-
-Beyond projects that use the library, there are third-party projects that build on top of it - schema validators,
-language bindings, format converters, and the like. See the curated [Ecosystem](https://json.nlohmann.me/community/ecosystem/) page.
-
 ## Supported compilers

 Though it's 2026 already, the support for C++11 is still a bit sparse. Currently, the following compilers are known to work:
@@ -1429,7 +1416,7 @@ I deeply appreciate the help of the following people.
 6. [Joshua C. Randall](https://github.com/jrandall) fixed a bug in the floating-point serialization.
 7. [Aaron Burghardt](https://github.com/aburgh) implemented code to parse streams incrementally. Furthermore, he greatly improved the parser class by allowing the definition of a filter function to discard undesired elements while parsing.
 8. [Daniel Kopeček](https://github.com/dkopecek) fixed a bug in the compilation with GCC 5.0.
-9. [Fiona Johanna Weber](https://github.com/Fiona-J-W) fixed a bug in and improved the performance of the comparison operators.
+9. [Florian Weber](https://github.com/Florianjw) fixed a bug in and improved the performance of the comparison operators.
 10. [Eric Cornelius](https://github.com/EricMCornelius) pointed out a bug in the handling with NaN and infinity values. He also improved the performance of the string escaping.
 11. [易思龙](https://github.com/likebeta) implemented a conversion from anonymous enums.
 12. [kepkin](https://github.com/kepkin) patiently pushed forward the support for Microsoft Visual Studio.
@@ -1531,14 +1518,14 @@ I deeply appreciate the help of the following people.
 108. [Kevin Tonon](https://github.com/ktonon) overworked the C++11 compiler checks in CMake.
 109. [Axel Huebl](https://github.com/ax3l) simplified a CMake check and added support for the [Spack package manager](https://spack.io).
 110. [Carlos O'Ryan](https://github.com/coryan) fixed a typo.
-111. [James Upjohn](https://github.com/jupjohn) fixed a version number in the compilers section.
+111. [James Upjohn](https://github.com/jammehcow) fixed a version number in the compilers section.
 112. [Chuck Atkins](https://github.com/chuckatkins) adjusted the CMake files to the CMake packaging guidelines and provided documentation for the CMake integration.
 113. [Jan Schöppach](https://github.com/dns13) fixed a typo.
 114. [martin-mfg](https://github.com/martin-mfg) fixed a typo.
 115. [Matthias Möller](https://github.com/TinyTinni) removed the dependency from `std::stringstream`.
 116. [agrianius](https://github.com/agrianius) added code to use alternative string implementations.
 117. [Daniel599](https://github.com/Daniel599) allowed to use more algorithms with the `items()` function.
-118. [Julius Rakow](https://github.com/juliusrakow) fixed the Meson include directory and fixed the links to [cppreference.com](https://cppreference.com).
+118. [Julius Rakow](https://github.com/jrakow) fixed the Meson include directory and fixed the links to [cppreference.com](https://cppreference.com).
 119. [Sonu Lohani](https://github.com/sonulohani) fixed the compilation with MSVC 2015 in debug mode.
 120. [grembo](https://github.com/grembo) fixed the test suite and re-enabled several test cases.
 121. [Hyeon Kim](https://github.com/simnalamburt) introduced the macro `JSON_INTERNAL_CATCH` to control the exception handling inside the library.
@@ -1589,7 +1576,7 @@ I deeply appreciate the help of the following people.
 166. [Mark Beckwith](https://github.com/wythe) fixed a typo.
 167. [yann-morin-1998](https://github.com/yann-morin-1998) helped to reduce the CMake requirement to version 3.1.
 168. [Konstantin Podsvirov](https://github.com/podsvirov) maintains a package for the MSYS2 software distro.
-169. [remyabel](https://github.com/remyabel2) added GNUInstallDirs to the CMake files.
+169. [remyabel](https://github.com/remyabel) added GNUInstallDirs to the CMake files.
 170. [Taylor Howard](https://github.com/taylorhoward92) fixed a unit test.
 171. [Gabe Ron](https://github.com/Macr0Nerd) implemented the `to_string` method.
 172. [Watal M. Iwasaki](https://github.com/heavywatal) fixed a Clang warning.
@@ -1616,7 +1603,7 @@ I deeply appreciate the help of the following people.
 193. [Hubert Chathi](https://github.com/uhoreg) made CMake's version config file architecture-independent.
 194. [OmnipotentEntity](https://github.com/OmnipotentEntity) implemented the binary values for CBOR, MessagePack, BSON, and UBJSON.
 195. [ArtemSarmini](https://github.com/ArtemSarmini) fixed a compilation issue with GCC 10 and fixed a leak.
-196. [Evgenii Sopov](https://github.com/sea5kg) integrated the library to the wsjcpp package manager.
+196. [Evgenii Sopov](https://github.com/sea-kg) integrated the library to the wsjcpp package manager.
 197. [Sergey Linev](https://github.com/linev) fixed a compiler warning.
 198. [Miguel Magalhães](https://github.com/magamig) fixed the year in the copyright.
 199. [Gareth Sylvester-Bradley](https://github.com/garethsb-sony) fixed a compilation issue with MSVC.
@@ -1710,7 +1697,7 @@ I deeply appreciate the help of the following people.
 287. [NN](https://github.com/NN---) added the Visual Studio output directory to `.gitignore`.
 288. [Romain Reignier](https://github.com/romainreignier) improved the performance of the vector output adapter.
 289. [Mike](https://github.com/Mike-Leo-Smith) fixed the `std::iterator_traits`.
-290. [Richard Hozák](https://github.com/richardhozak) added macro `JSON_NO_ENUM` to disable default enum conversions.
+290. [Richard Hozák](https://github.com/zxey) added macro `JSON_NO_ENUM` to disable default enum conversions.
 291. [vakokako](https://github.com/vakokako) fixed tests when compiling with C++20.
 292. [Alexander “weej” Jones](https://github.com/alexweej) fixed an example in the README.
 293. [Eli Schwartz](https://github.com/eli-schwartz) added more files to the `include.zip` archive.
@@ -1735,7 +1722,7 @@ I deeply appreciate the help of the following people.
 312. [Gareth Sylvester-Bradley](https://github.com/garethsb) added `operator/=` and `operator/` to construct JSON pointers.
 313. [Michael Macnair](https://github.com/mykter) added support for afl-fuzz testing.
 314. [Berkus Decker](https://github.com/berkus) fixed a typo in the README.
-315. [Illia Polishchuk](https://github.com/ilqvya) improved the CMake testing.
+315. [Illia Polishchuk](https://github.com/effolkronium) improved the CMake testing.
 316. [Ikko Ashimine](https://github.com/eltociear) fixed a typo.
 317. [Raphael Grimm](https://github.com/barcode) added the possibility to define a custom base class.
 318. [tocic](https://github.com/tocic) fixed typos in the documentation.
@@ -1805,66 +1792,6 @@ I deeply appreciate the help of the following people.
 382. [bitFiedler](https://github.com/bitFiedler) made GDB pretty printer work with Python 3.8.
 383. [Gianfranco Costamagna](https://github.com/LocutusOfBorg) fixed a compiler warning.
 384. [risa2000](https://github.com/risa2000) made `std::filesystem::path` conversion to/from UTF-8 encoded string explicit.
-385. [AM](https://github.com/maqnouch) fixed typos in the README.
-386. [dmenendez-gruposantander](https://github.com/dmenendez-gruposantander) fixed typos in the comments of the examples.
-387. [Mihai Stan](https://github.com/mstan-xx) fixed comparisons against the literal `0`.
-388. [Matt Gumbel](https://github.com/intelmatt) fixed some `-Weffc++` warnings.
-389. [vimpunk](https://github.com/vimpunk) moved a lambda out of an unevaluated context to support older compilers.
-390. [Chris Harris](https://github.com/cjh1) fixed the compilation with GCC 4.8.
-391. [Palmer Dabbelt](https://github.com/palmer-dabbelt) generated and installed a pkg-config file.
-392. [Gus Pozuelo](https://github.com/ap-viavi) made `ordered_map` compatible with GCC 5.5, Clang 3.6, and Xcode 9.
-393. [AK](https://github.com/Lioncky) fixed an MSVC build error caused by the `min`/`max` macros from `windows.h`.
-394. [Sergiu Deitsch](https://github.com/sergiud) provided a fallback for missing `char8_t` support.
-395. [Xiaochuan Ye](https://github.com/XueSongTap) fixed `from_msgpack` for `std::byte` input by specializing `std::char_traits`.
-396. [Ville Vesilehto](https://github.com/thevilledev) fixed an overflow in the BJData size calculation and rejected overflowing negative integers in CBOR.
-397. [NmPassTHFan](https://github.com/nmpassthf) replaced the deprecated `std::is_trivial` for C++26.
-398. [Chris Ever](https://github.com/chirsz-ever) added the `ignore_trailing_commas` parser option.
-399. [Kuan-Fu Wu](https://github.com/kfwu1999) fixed the example code for `json_pointer` initialization.
-400. [David Kilzer](https://github.com/ddkilzer) added a missing header to the input adapters.
-401. [Miko](https://github.com/mikomikotaishi) added proper C++20 module support, simplified the module API, and fixed missing exports.
-402. [hitgirl](https://github.com/hitgil) fixed the CMake configuration when cross-compiling.
-403. [Devon Thomas](https://github.com/ThomaDevOSU) mentioned the Artistic Style formatting in the contribution guidelines.
-404. [Erik Hu](https://github.com/Erikhu1) made Coveralls upload errors non-fatal in the CI.
-405. [co63oc](https://github.com/co63oc) fixed typos.
-406. [DmitriBogdanov](https://github.com/DmitriBogdanov) fixed broken package manager links in the documentation.
-407. [Bander](https://github.com/banderzhm) improved the MSVC compatibility of the C++ modules.
-408. [Andy Choi](https://github.com/ccpong) removed an unnecessary `template` keyword before `get` in the README and the documentation.
-409. [SamareshSingh](https://github.com/ssam18) fixed single-element brace initialization to copy/move instead of wrapping in an array, fixed the `WITH_DEFAULT` macros for `ordered_map`, and handled moved events in `serve_header.py`.
-410. [Aditya](https://github.com/Lumowhisp) improved the documentation of the documentation generation.
-411. [cheese1](https://github.com/cheese1) clarified the README.
-412. [KhloodElhossiny](https://github.com/khloodelhossiny) enabled `std::string_view` keys in `operator[]`.
-413. [Charles Cabergs](https://github.com/cacharle) fixed a `-Wtautological-constant-out-of-range-compare` warning.
-414. [EALePain](https://github.com/EALePain) made the `std::tuple` conversion work with reference types such as `std::tie`.
-415. [koala_oishi](https://github.com/chibi-dogs) fixed grammatical wording in the README.
-416. [riccardoori11](https://github.com/riccardoori11) fixed a typo in the documentation.
-417. [Swastik Bose](https://github.com/VasuBhakt) fixed the parent pointers after `update()` with `JSON_DIAGNOSTICS` and fixed the Doxygen autolinking of requirements.
-418. [trdesilva](https://github.com/trdesilva) added `front`, `pop_front`, and `push_front` to `json_pointer`.
-419. [Akhilesh Arora](https://github.com/akhilesharora) fixed an incomplete-type error with `ordered_json`.
-420. [Hariom Phulre](https://github.com/hariomphulre) fixed the C++20 modules compilation with GCC.
-421. [Kirill Lokotkov](https://github.com/RUSLoker) fixed printing `long double` values.
-422. [George Sedov](https://github.com/radistmorse) added the `NLOHMANN_DEFINE_TYPE_*_WITH_NAMES` macros.
-423. [Caillin Nugent](https://github.com/nugentcaillin) added the `NLOHMANN_JSON_SERIALIZE_ENUM_STRICT` macro.
-424. [Cosmin D.](https://github.com/drcosmin) fixed `std::filesystem::path` conversions and added an MSVC workaround for `std::unique_ptr`.
-425. [Paul Dreik](https://github.com/pauldreik) fixed a test relying on implementation-specific behavior.
-426. [Daniel Falk](https://github.com/daniel-falk) added missing copyright notices to the SBOM.
-427. [Federico Sfriso](https://github.com/federicosfriso05-dotcom) added support for constructing JSON values from C++20 range views.
-428. [Luke Banicevic](https://github.com/banaboi) fixed corrupt BSON output for lengths exceeding `INT32_MAX`, cleaned up the BSON writer, and improved the documentation.
-429. [Patrick Armstrong](https://github.com/Patrick10199) updated the CBOR references and the half-precision float assertions.
-430. [Yash Bavadiya](https://github.com/xevrion) added checks to all BSON reads.
-431. [hum4nBeing](https://github.com/hum4nBeing) fixed the overflow handling of high-precision numbers in UBJSON.
-432. [tomatotomata](https://github.com/tomatotomata) added checks for reading CBOR tagged subtypes.
-433. [YingqiDuan](https://github.com/YingqiDuan) documented the BSON interoperability.
-434. [KBS](https://github.com/youdie006) documented the standards compliance and the strictness of `parse()` and `operator>>`.
-435. [Petr Bělohlávek](https://github.com/petrbel) added Clang 21 and 22 to the CI.
-436. [Dmitry Rantovov](https://github.com/darkdi) fixed the placement of a CBOR documentation block.
-437. [ljcjclljc](https://github.com/ljcjclljc) fixed the comparison of large unsigned integers with signed integers.
-438. [Sahil Kamate](https://github.com/sahilkamate03) fixed the handling of CBOR tags 0-5 and 21-23.
-439. [Krishnanand G](https://github.com/Krishnanand-G) made the UBJSON writer reject `use_type` without `use_size`.
-440. [whn](https://github.com/Whning0513) documented the lenient BSON input handling and corrected the complexity of `to_bson`.
-441. [elix3r](https://github.com/22elix3r) fixed `update()` with `merge_objects` when merging a primitive into an object.
-442. [Avionic Harshit](https://github.com/avionicharshit-byte) made `diff()` linear when an array shrinks.
-443. [Qatadaha Bin Matloob](https://github.com/qatcod) fixed comparisons between integers and floats and fixed unparsable BJData output.
-444. [Wu Shuwen](https://github.com/dajiaohuang) removed an unused include.

 Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.

@@ -1875,13 +1802,13 @@ The library itself consists of a single header file licensed under the MIT licen
 - [**amalgamate.py - Amalgamate C source and header files**](https://github.com/edlund/amalgamate) to create a single header file
 - [**American fuzzy lop**](https://lcamtuf.coredump.cx/afl/) for fuzz testing
 - [**AppVeyor**](https://www.appveyor.com) for [continuous integration](https://ci.appveyor.com/project/nlohmann/json) on Windows
- [**Artistic Style**](https://astyle.sourceforge.net) for automatic source code indentation
+- [**Artistic Style**](http://astyle.sourceforge.net) for automatic source code indentation
 - [**Clang**](https://clang.llvm.org) for compilation with code sanitizers
 - [**CMake**](https://cmake.org) for build automation
 - [**Codacy**](https://www.codacy.com) for further [code analysis](https://app.codacy.com/gh/nlohmann/json/dashboard)
 - [**Coveralls**](https://coveralls.io) to measure [code coverage](https://coveralls.io/github/nlohmann/json)
 - [**Coverity Scan**](https://scan.coverity.com) for [static analysis](https://scan.coverity.com/projects/nlohmann-json)
- [**cppcheck**](https://cppcheck.sourceforge.io) for static analysis
+- [**cppcheck**](http://cppcheck.sourceforge.net) for static analysis
 - [**doctest**](https://github.com/onqtam/doctest) for the unit tests
 - [**GitHub Changelog Generator**](https://github.com/skywinder/github-changelog-generator) to generate the [ChangeLog](https://github.com/nlohmann/json/blob/develop/ChangeLog.md)
 - [**Google Benchmark**](https://github.com/google/benchmark) to implement the benchmarks
@@ -1896,15 +1823,6 @@ The library itself consists of a single header file licensed under the MIT licen

 ## Notes

-### Standards compliance
-
-The library targets strict conformance with [RFC 8259](https://tools.ietf.org/html/rfc8259.html). Both the original [JSONTestSuite](https://github.com/nst/JSONTestSuite) and its updated revision are exercised in CI; their test data is downloaded from [`nlohmann/json_test_data`](https://github.com/nlohmann/json_test_data) at configure time rather than committed to this repository (see [`tests/src/unit-testsuites.cpp`](https://github.com/nlohmann/json/blob/develop/tests/src/unit-testsuites.cpp)):
-
- The updated revision runs all mandatory `y_` (must-accept) and `n_` (must-reject) cases through the strict [`parse()`](https://json.nlohmann.me/api/basic_json/parse/) entry point; the original suite runs its `n_` cases through `parse()` and its `y_` cases through [`operator>>`](https://json.nlohmann.me/api/operator_gtgt/).
- The `i_` (implementation-defined) cases are, by RFC 8259, free to be accepted *or* rejected, so "passing all `i_` cases" is not a meaningful conformance metric. The library makes deliberate, documented choices there: nesting depth is not artificially limited, a leading UTF-8 byte order mark is silently ignored, [Unicode noncharacters](https://www.unicode.org/faq/private_use.html#nonchar1) are forwarded unchanged, invalid UTF-8 and lone/unpaired UTF-16 surrogates are rejected (stricter than required), and a number that cannot be stored without becoming `NaN`/`INF` raises [`out_of_range.406`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range406).
-
-One behavioral nuance is worth calling out, because a superficial test often misreads it as non-compliance: [`parse()`](https://json.nlohmann.me/api/basic_json/parse/) is strict and rejects trailing data after a value, whereas [`operator>>`](https://json.nlohmann.me/api/operator_gtgt/) follows relaxed iostream semantics — it parses a single value and leaves the stream positioned right after it. Feeding "a valid document followed by trailing bytes" through `operator>>` reports success; the same input through `parse()` is rejected. This is a documented two-API design, not a conformance gap. See [**parsing**](https://json.nlohmann.me/features/parsing/) for details.
-
 ### Character encoding

 The library supports **Unicode input** as follows:
@@ -213,38 +213,18 @@ add_custom_target(ci_test_legacycomparison
 )

 ###############################################################################
-# Validate UTF-8 with simdutf.
+# Enable brace-init copy semantics.
 ###############################################################################

-add_custom_target(ci_test_simdutf
+add_custom_target(ci_test_brace_init_copy_semantics
    COMMAND ${CMAKE_COMMAND}
    -DCMAKE_BUILD_TYPE=Debug -GNinja
-    -DJSON_BuildTests=ON -DJSON_TestSimdutf=ON
-    # simdutf needs C++17, so the library falls back to its scalar validator
-    # below that: build the suite at C++11 to cover the fallback with the macro
-    # defined, and at C++17 to run every test against simdutf itself
-    "-DJSON_TestStandards=11\;17"
-    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_simdutf
-    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_simdutf
-    COMMAND cd ${PROJECT_BINARY_DIR}/build_simdutf && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
-    COMMENT "Compile and test with simdutf UTF-8 validation enabled"
-)
-
-###############################################################################
-# Enable strict NUL-byte handling.
-###############################################################################
-
-add_custom_target(ci_test_strict_nul_handling
-    COMMAND ${CMAKE_COMMAND}
-    -DCMAKE_BUILD_TYPE=Debug -GNinja
-    -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_StrictNulHandling=ON
-    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_strict_nul_handling
-    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_strict_nul_handling
-    # unit-testsuites contains a fixture (a "1e308" test value) that relies on the
-    # legacy NUL-as-end-of-input behavior this macro disables; exclude it here, as
-    # it is expected to fail under strict NUL handling and is out of scope for it
-    COMMAND cd ${PROJECT_BINARY_DIR}/build_strict_nul_handling && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure -E "test-testsuites"
-    COMMENT "Compile and test with strict NUL-byte handling enabled"
+    -DJSON_BuildTests=ON -DJSON_FastTests=ON
+    -DCMAKE_CXX_FLAGS=-DJSON_BRACE_INIT_COPY_SEMANTICS=1
+    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_brace_init_copy_semantics
+    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_brace_init_copy_semantics
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_brace_init_copy_semantics && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
+    COMMENT "Compile and test with brace-init copy semantics enabled"
 )

 ###############################################################################
@@ -262,59 +242,6 @@ add_custom_target(ci_test_noglobaludls
    COMMENT "Compile and test with global UDLs disabled"
 )

-###############################################################################
-# Disable enum serialization.
-###############################################################################
-
-add_custom_target(ci_test_disableenumserialization
-    COMMAND ${CMAKE_COMMAND}
-    -DCMAKE_BUILD_TYPE=Debug -GNinja
-    -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_DisableEnumSerialization=ON
-    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_disableenumserialization
-    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_disableenumserialization
-    COMMAND cd ${PROJECT_BINARY_DIR}/build_disableenumserialization && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
-    COMMENT "Compile and test with enum serialization disabled"
-)
-
-###############################################################################
-# Skip the multiple-inclusion library version check.
-###############################################################################
-
-# tests/src/skip_library_version_check.cpp deliberately simulates a scenario
-# (mixing two differently-versioned inclusions of the library in one
-# translation unit) that unavoidably triggers the compiler's own "macro
-# redefined" warning, so -- unlike the ci_test_* targets above -- it is
-# compiled directly here, with a modest warning set, instead of being folded
-# into the library's own -Weverything/-Werror unit test matrix.
-add_custom_target(ci_test_skiplibraryversioncheck
-    COMMAND ${CMAKE_COMMAND} -E make_directory ${PROJECT_BINARY_DIR}/skip_library_version_check
-    COMMAND ${CMAKE_CXX_COMPILER} -std=c++11 -Wall -Wextra
-        -I${PROJECT_SOURCE_DIR}/include
-        ${PROJECT_SOURCE_DIR}/tests/src/skip_library_version_check.cpp
-        -o ${PROJECT_BINARY_DIR}/skip_library_version_check/skip_library_version_check
-    COMMAND ${PROJECT_BINARY_DIR}/skip_library_version_check/skip_library_version_check
-    COMMENT "Compile and run a translation unit simulating a mismatched library version, with JSON_SKIP_LIBRARY_VERSION_CHECK defined"
-)
-
-###############################################################################
-# Disable thread-local storage.
-###############################################################################
-
-# Without thread-local storage, copying and comparing cannot bound their
-# descent and handle every object and array without the call stack. Those paths
-# are otherwise only reached by values nested deeper than the bound, so this
-# target is what runs the whole test suite through them.
-add_custom_target(ci_test_no_thread_local
-    COMMAND ${CMAKE_COMMAND}
-    -DCMAKE_BUILD_TYPE=Debug -GNinja
-    -DJSON_BuildTests=ON
-    -DCMAKE_CXX_FLAGS=-DJSON_NO_THREAD_LOCAL
-    -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_no_thread_local
-    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_no_thread_local
-    COMMAND cd ${PROJECT_BINARY_DIR}/build_no_thread_local && ${CMAKE_CTEST_COMMAND} --parallel ${N} --output-on-failure
-    COMMENT "Compile and test without thread-local storage"
-)
-
 ###############################################################################
 # Coverage.
 ###############################################################################
@@ -367,7 +294,7 @@ file(GLOB_RECURSE INDENT_FILES
        ${PROJECT_SOURCE_DIR}/tests/src/*.cpp
        ${PROJECT_SOURCE_DIR}/tests/src/*.hpp
        ${PROJECT_SOURCE_DIR}/tests/benchmarks/src/benchmarks.cpp
-    ${PROJECT_SOURCE_DIR}/docs/mkdocs/docs/examples/*.cpp
+    ${PROJECT_SOURCE_DIR}/docs/examples/*.cpp
 )

 set(include_dir ${PROJECT_SOURCE_DIR}/single_include/nlohmann)
@@ -542,7 +469,7 @@ add_custom_target(ci_infer

 add_custom_target(ci_offline_testdata
    COMMAND mkdir -p ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data
-    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data && ${GIT_TOOL} clone -c advice.detachedHead=false --branch v3.2.0 https://github.com/nlohmann/json_test_data.git --quiet --depth 1
+    COMMAND cd ${PROJECT_BINARY_DIR}/build_offline_testdata/test_data && ${GIT_TOOL} clone -c advice.detachedHead=false --branch v3.1.0 https://github.com/nlohmann/json_test_data.git --quiet --depth 1
    COMMAND ${CMAKE_COMMAND}
        -DCMAKE_BUILD_TYPE=Debug -GNinja
        -DJSON_BuildTests=ON -DJSON_FastTests=ON -DJSON_TestDataDirectory=${PROJECT_BINARY_DIR}/build_offline_testdata/test_data/json_test_data
@@ -619,7 +546,7 @@ add_custom_target(ci_single_binaries
 add_custom_target(ci_benchmarks
    COMMAND ${CMAKE_COMMAND}
        -DCMAKE_BUILD_TYPE=Release -GNinja
-        -S${PROJECT_SOURCE_DIR}/tests/benchmarks -B${PROJECT_BINARY_DIR}/build_benchmarks
+        -S${PROJECT_SOURCE_DIR}/benchmarks -B${PROJECT_BINARY_DIR}/build_benchmarks
    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_benchmarks --target json_benchmarks
    COMMAND cd ${PROJECT_BINARY_DIR}/build_benchmarks && ./json_benchmarks
    COMMENT "Run benchmarks"
@@ -742,6 +669,7 @@ add_custom_target(ci_test_compiler_default
 add_custom_target(ci_cuda_example
    COMMAND ${CMAKE_COMMAND}
        -DCMAKE_BUILD_TYPE=Debug -GNinja
+        -DCMAKE_CUDA_HOST_COMPILER=g++-8
        -S${PROJECT_SOURCE_DIR}/tests/cuda_example -B${PROJECT_BINARY_DIR}/build_cuda_example
    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_cuda_example
 )
@@ -792,11 +720,6 @@ add_custom_target(ci_icpx
 # to zero and does not honor NaN ordering; -Kieee restores strict IEEE 754 behavior
 # (needed for the dtoa/grisu and NaN-comparison code paths).
 #
-# -tp=px pins the target processor to the generic x86-64 baseline (SSE2-only) to avoid
-# a nvc++ 25.5 / LLVM issue: when nvc++ auto-detects -tp from the runner's CPU (e.g. -tp znver4),
-# certain attribute combinations trigger an llc instruction-selection crash on std::ldexp<unsigned>.
-# Pinning to px removes this variability and is robust to future llc/nvc++ updates.
-#
 # The following tests are excluded as they trigger known nvc++ 25.5 defects (not
 # library bugs); see https://github.com/nlohmann/json for tracking. Only the
 # affected language-standard variants are excluded so coverage is otherwise kept:
@@ -810,7 +733,7 @@ add_custom_target(ci_nvhpc
    COMMAND ${CMAKE_COMMAND}
        -DCMAKE_BUILD_TYPE=Debug -GNinja
        -DCMAKE_C_COMPILER=nvc -DCMAKE_CXX_COMPILER=nvc++
-        -DCMAKE_CXX_FLAGS="-Kieee;-tp=px"
+        -DCMAKE_CXX_FLAGS=-Kieee
        -DJSON_BuildTests=ON -DJSON_FastTests=ON
        -S${PROJECT_SOURCE_DIR} -B${PROJECT_BINARY_DIR}/build_nvhpc
    COMMAND ${CMAKE_COMMAND} --build ${PROJECT_BINARY_DIR}/build_nvhpc
@@ -5,14 +5,8 @@
 # -Wno-extra-semi-stmt            The library uses assert which triggers this warning.
 # -Wno-padded                     We do not care about padding warnings.
 # -Wno-covered-switch-default     All switches list all cases and a default case.
-# -Wno-c2y-extensions             Clang 22.1 diagnoses __COUNTER__ as a C2y extension, also in
-#                                 C++ mode. The library does not use __COUNTER__; the warnings
-#                                 all come from vendored Doctest (SECTION/TEST_CASE macros).
-# -Wno-unsafe-buffer-usage        Pervasive: the library's own low-level numeric/buffer code
-#                                 (to_chars, serializer, lexer, binary reader/writer, input
-#                                 adapters, json_pointer) plus vendored Doctest itself (~208
-#                                 distinct sites measured 2026-07-08 on clang trunk) all use
-#                                 raw pointer arithmetic / libc string calls by necessity.
+# -Wno-unsafe-buffer-usage        Otherwise library code (strlen) would not compile.
+# -Wno-missing-noreturn           We found no way to silence this warning otherwise, see PR #4871

 set(CLANG_CXXFLAGS
    -Werror
@@ -23,6 +17,6 @@ set(CLANG_CXXFLAGS
    -Wno-extra-semi-stmt
    -Wno-padded
    -Wno-covered-switch-default
-    -Wno-c2y-extensions
    -Wno-unsafe-buffer-usage
+    -Wno-missing-noreturn
 )
@@ -1,5 +1,5 @@
 set(JSON_TEST_DATA_URL     https://github.com/nlohmann/json_test_data)
-set(JSON_TEST_DATA_VERSION 3.2.0)
+set(JSON_TEST_DATA_VERSION 3.1.0)

 include(ExternalProject)

@@ -77,7 +77,7 @@ if(CMAKE_CROSSCOMPILING)
 endif()
 if(NOT DEFINED LIBCPP_VERSION_OUTPUT_CACHED)
    try_run(RUN_RESULT_VAR COMPILE_RESULT_VAR
-        "${CMAKE_BINARY_DIR}" SOURCES "${CMAKE_CURRENT_LIST_DIR}/detect_libcpp_version.cpp"
+        "${CMAKE_BINARY_DIR}" SOURCES "${CMAKE_SOURCE_DIR}/cmake/detect_libcpp_version.cpp"
        RUN_OUTPUT_VARIABLE LIBCPP_VERSION_OUTPUT
        COMPILE_OUTPUT_VARIABLE LIBCPP_VERSION_COMPILE_OUTPUT
    )
@@ -4,7 +4,6 @@
 # -Wno-aggregate-return  The library uses aggregate returns.
 # -Wno-long-long         The library uses the long long type to interface with system functions.
 # -Wno-namespaces        The library uses namespaces.
-# -Wno-nrvo              Doctest triggers this warning.
 # -Wno-padded            We do not care about padding warnings.
 # -Wno-system-headers    We do not care about warnings in system headers.
 # -Wno-templates         The library uses templates.
@@ -232,7 +231,6 @@ set(GCC_CXXFLAGS
    -Wnonnull
    -Wnonnull-compare
    -Wnormalized=nfkc
-    -Wno-nrvo
    -Wnull-dereference
    -Wodr
    -Wold-style-cast
@@ -1,57 +1,24 @@
 # generate Bazel BUILD file
-#
-# usage: cmake -P cmake/scripts/gen_bazel_build_file.cmake (or: make BUILD.bazel)
-#
-# The header list of the "json" target is derived from the files in include/. Everything else is fixed text below,
-# so edit this script rather than BUILD.bazel.

-get_filename_component(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/../.." ABSOLUTE)
+set(PROJECT_ROOT "${CMAKE_CURRENT_LIST_DIR}/../..")
 set(BUILD_FILE "${PROJECT_ROOT}/BUILD.bazel")

-file(GLOB_RECURSE HEADERS LIST_DIRECTORIES false RELATIVE "${PROJECT_ROOT}" "${PROJECT_ROOT}/include/*.hpp")
-list(SORT HEADERS)
-
-set(CONTENT [=[
-load("@rules_cc//cc:cc_library.bzl", "cc_library")
-load("@rules_license//rules:license.bzl", "license")
-
-package(
-    default_applicable_licenses = [":license"],
-)
-
-exports_files([
-    "LICENSE.MIT",
-])
-
-license(
-    name = "license",
-    license_kinds = ["@rules_license//licenses/spdx:MIT"],
-    license_text = "LICENSE.MIT",
-)
+file(GLOB_RECURSE HEADERS LIST_DIRECTORIES false RELATIVE "${PROJECT_ROOT}" "include/*.hpp")

+file(WRITE "${BUILD_FILE}" [=[
 cc_library(
    name = "json",
    hdrs = [
 ]=])

 foreach(header ${HEADERS})
-    string(APPEND CONTENT "        \"${header}\",\n")
+    file(APPEND "${BUILD_FILE}" "        \"${header}\",\n")
 endforeach()

-string(APPEND CONTENT [=[
+file(APPEND "${BUILD_FILE}" [=[
    ],
    includes = ["include"],
    visibility = ["//visibility:public"],
-)
-
-cc_library(
-    name = "singleheader-json",
-    hdrs = [
-        "single_include/nlohmann/json.hpp",
-    ],
-    includes = ["single_include"],
-    visibility = ["//visibility:public"],
+    alwayslink = True,
 )
 ]=])
-
-file(WRITE "${BUILD_FILE}" "${CONTENT}")
@@ -1,112 +0,0 @@
-# Shared extractor for the JSON_HEDLEY_* macro names defined in hedley.hpp.
-#
-# Every macro that hedley.hpp #defines must be #undef-ed again once json.hpp
-# has been fully processed (see include/nlohmann/detail/macro_unscope.hpp
-# and https://github.com/nlohmann/json/issues/5408). Deriving the macro list
-# straight from hedley.hpp here -- instead of hand-maintaining it in two
-# places -- means hedley_undef.hpp and the regression test that checks for
-# leaked macros can never drift apart, even after a future `make
-# update_hedley` pulls in new macros from upstream Hedley.
-#
-#   MODE=undef  (default): write hedley_undef.hpp (SPDX header, #pragma once,
-#               one #undef per macro name) -- used by `make update_hedley_undef`
-#   MODE=checks:            write one #ifdef/FAIL_CHECK/#endif per macro name,
-#               meant to be #include-d inside a TEST_CASE -- used by
-#               tests/CMakeLists.txt to (re)generate the include for
-#               tests/src/unit-no-macro-leak.cpp
-#
-# Required variables:
-#   HEDLEY_HPP  path to include/nlohmann/thirdparty/hedley/hedley.hpp
-#   OUTPUT      path of the file to (over)write
-# Optional:
-#   MODE        "undef" (default) or "checks"
-
-if(NOT DEFINED HEDLEY_HPP OR NOT DEFINED OUTPUT)
-    message(FATAL_ERROR "HEDLEY_HPP and OUTPUT must be set")
-endif()
-
-if(NOT EXISTS "${HEDLEY_HPP}")
-    message(FATAL_ERROR "Hedley header not found: ${HEDLEY_HPP}")
-endif()
-
-if(NOT DEFINED MODE)
-    set(MODE undef)
-endif()
-
-if(NOT MODE STREQUAL "undef" AND NOT MODE STREQUAL "checks")
-    message(FATAL_ERROR "MODE must be undef or checks, got: ${MODE}")
-endif()
-
-# Line-anchored, like `grep -oE "^[[:blank:]]*#[[:blank:]]*define[[:blank:]]+JSON_HEDLEY_[A-Za-z0-9_]+"`.
-# Unanchored matching would also pick up JSON_HEDLEY_* mentions inside
-# comments or string literals elsewhere in the file, which must not turn
-# into #undef lines.
-file(STRINGS "${HEDLEY_HPP}" hedley_lines)
-set(macro_names)
-foreach(line IN LISTS hedley_lines)
-    if("${line}" MATCHES "^[ \t]*#[ \t]*define[ \t]+(JSON_HEDLEY_[A-Za-z0-9_]+)")
-        list(APPEND macro_names "${CMAKE_MATCH_1}")
-    endif()
-endforeach()
-
-if(NOT macro_names)
-    message(FATAL_ERROR "No JSON_HEDLEY_* macros found in ${HEDLEY_HPP}")
-endif()
-
-list(REMOVE_DUPLICATES macro_names)
-# Lexicographic, locale-independent (ASCII-only names) -- matches `LC_ALL=C sort`.
-list(SORT macro_names COMPARE STRING)
-list(LENGTH macro_names macro_count)
-
-set(generated "")
-if(MODE STREQUAL "undef")
-    # Same banner `make update_hedley_undef` would stamp by hand, so the
-    # recipe is self-contained and its output is byte-stable across reruns.
-    # The embedded SPDX tags below are part of the *generated* file's
-    # content, not a REUSE header for this .cmake script itself (which is
-    # already covered by the blanket "Files: *" rule in .reuse/dep5) -- keep
-    # them wrapped in REUSE-IgnoreStart/End so `reuse lint` does not try to
-    # parse "MIT\n")" as this file's own SPDX-License-Identifier value.
-    # REUSE-IgnoreStart
-    string(APPEND generated "//     __ _____ _____ _____\n")
-    string(APPEND generated "//  __|  |   __|     |   | |  JSON for Modern C++\n")
-    string(APPEND generated "// |  |  |__   |  |  | | | |  version 3.12.0\n")
-    string(APPEND generated "// |_____|_____|_____|_|___|  https://github.com/nlohmann/json\n")
-    string(APPEND generated "//\n")
-    string(APPEND generated "// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>\n")
-    string(APPEND generated "// SPDX-License-Identifier: MIT\n")
-    # REUSE-IgnoreEnd
-    string(APPEND generated "\n")
-    string(APPEND generated "#pragma once\n")
-    string(APPEND generated "\n")
-    foreach(name IN LISTS macro_names)
-        string(APPEND generated "#undef ${name}\n")
-    endforeach()
-else()
-    string(APPEND generated "// This file is generated by cmake/scripts/gen_hedley_undef_check.cmake\n")
-    string(APPEND generated "// from include/nlohmann/thirdparty/hedley/hedley.hpp. Do not edit it by\n")
-    string(APPEND generated "// hand -- it is regenerated on every build. ${macro_count} macros checked.\n\n")
-    foreach(name IN LISTS macro_names)
-        string(APPEND generated "#ifdef ${name}\n")
-        string(APPEND generated "    FAIL_CHECK(\"${name} leaked after including nlohmann/json.hpp\");\n")
-        string(APPEND generated "#endif\n")
-    endforeach()
-endif()
-
-get_filename_component(output_dir "${OUTPUT}" DIRECTORY)
-if(output_dir)
-    file(MAKE_DIRECTORY "${output_dir}")
-endif()
-
-# Avoid rewriting the file (and busting downstream incremental rebuilds)
-# when the content has not actually changed.
-set(write_output TRUE)
-if(EXISTS "${OUTPUT}")
-    file(READ "${OUTPUT}" existing_content)
-    if(existing_content STREQUAL generated)
-        set(write_output FALSE)
-    endif()
-endif()
-if(write_output)
-    file(WRITE "${OUTPUT}" "${generated}")
-endif()
@@ -48,7 +48,6 @@ INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::from_bjdata', 'Fu
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::from_bson', 'Function', 'api/basic_json/from_bson/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::from_cbor', 'Function', 'api/basic_json/from_cbor/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::from_msgpack', 'Function', 'api/basic_json/from_msgpack/index.html');
-INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::from_bon8', 'Function', 'api/basic_json/from_bon8/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::from_ubjson', 'Function', 'api/basic_json/from_ubjson/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::front', 'Method', 'api/basic_json/front/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::get', 'Method', 'api/basic_json/get/index.html');
@@ -122,7 +121,6 @@ INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_bjdata', 'Func
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_bson', 'Function', 'api/basic_json/to_bson/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_cbor', 'Function', 'api/basic_json/to_cbor/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_msgpack', 'Function', 'api/basic_json/to_msgpack/index.html');
-INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_bon8', 'Function', 'api/basic_json/to_bon8/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_string', 'Method', 'api/basic_json/to_string/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::to_ubjson', 'Function', 'api/basic_json/to_ubjson/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('basic_json::value', 'Method', 'api/basic_json/value/index.html');
@@ -173,7 +171,6 @@ INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats: BJData', 'Gui
 INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats: BSON', 'Guide', 'features/binary_formats/bson/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats: CBOR', 'Guide', 'features/binary_formats/cbor/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats: MessagePack', 'Guide', 'features/binary_formats/messagepack/index.html');
-INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats: BON8', 'Guide', 'features/binary_formats/bon8/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Binary Formats: UBJSON', 'Guide', 'features/binary_formats/ubjson/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Binary Values', 'Guide', 'features/binary_values/index.html');
 INSERT INTO searchIndex(name, type, path) VALUES ('Comments', 'Guide', 'features/comments/index.html');
@@ -4,7 +4,7 @@
  "archive": "JSON_for_Modern_C++.tgz",
  "author": {
    "name": "Niels Lohmann",
-    "link": "https://nlohmann.me"
+    "link": "https://twitter.com/nlohmann"
  },
  "aliases": ["nlohmann/json"]
 }
@@ -8,8 +8,8 @@ static bool accept(InputType&& i,
                   const bool ignore_trailing_commas = false);

 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static bool accept(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static bool accept(IteratorType first, IteratorType last,
                   const bool ignore_comments = false,
                   const bool ignore_trailing_commas = false);
 ```
@@ -17,11 +17,10 @@ static bool accept(IteratorType first, SentinelType last,
 Checks whether the input is valid JSON.

 1. Reads from a compatible input.
-2. Reads from a pair of character iterators, or an iterator and a sentinel of a different type (C++20 ranges support)
+2. Reads from a pair of character iterators
    
    The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted
-    respectively as UTF-8, UTF-16, and UTF-32. If `SentinelType` differs from `IteratorType`, it must be comparable to
-    the iterator type with `operator!=`.
+    respectively as UTF-8, UTF-16, and UTF-32.
    
 Unlike the [`parse()`](parse.md) function, this function neither throws an exception in case of invalid JSON input
 (i.e., a parse error) nor creates diagnostic information.
@@ -36,8 +35,7 @@ Unlike the [`parse()`](parse.md) function, this function neither throws an excep
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters (throws if null)
    - a `std::string`
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type, for instance.
@@ -45,12 +43,6 @@ Unlike the [`parse()`](parse.md) function, this function neither throws an excep
    - a pair of `std::string::iterator` or `std::vector<std::uint8_t>::iterator`
    - a pair of pointers such as `ptr` and `ptr + len`

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -68,7 +60,7 @@ Unlike the [`parse()`](parse.md) function, this function neither throws an excep
 :   iterator to the start of the character range

 `last` (in)
-:   iterator to the end of the character range, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of the character range

 ## Return value

@@ -90,10 +82,6 @@ Linear in the length of the input. The parser is a predictive LL(1) parser.

 A UTF-8 byte order mark is silently ignored.

-By default, a `'\0'` (NUL) byte anywhere in the input is treated as end of input, rather than as an ordinary (and,
-outside of a string, invalid) byte; see the [FAQ entry](../../home/faq.md#nul-bytes-in-the-input) for details and the
-[`JSON_STRICT_NUL_HANDLING`](../macros/json_strict_nul_handling.md) macro to opt into rejecting it instead.
-
 ## Examples

 ??? example
@@ -115,19 +103,13 @@ outside of a string, invalid) byte; see the [FAQ entry](../../home/faq.md#nul-by
 - [parse](parse.md) - deserialize from a compatible input
 - [sax_parse](sax_parse.md) - parse input using the SAX interface
 - [operator>>](../operator_gtgt.md) - deserialize from stream
- [`JSON_STRICT_NUL_HANDLING`](../macros/json_strict_nul_handling.md) - opt in to rejecting a NUL byte in the input
-  instead of treating it as end of input

 ## Version history

 - Added in version 3.0.0.
 - Ignoring comments via `ignore_comments` added in version 3.9.0.
 - Changed [runtime assertion](../../features/assertions.md) in case of `FILE*` null pointers to exception in version 3.12.0.
- Added `ignore_trailing_commas` in version 3.13.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- `JSON_STRICT_NUL_HANDLING` added in version 3.13.0 to optionally reject a NUL byte in the input instead of treating
-  it as end of input; planned to become the default in version 4.0.0.
+- Added `ignore_trailing_commas` in version 3.12.x.

 !!! warning "Deprecation"

@@ -14,11 +14,7 @@ To store objects in C++, a type is defined by the template parameters explained
 ## Template parameters

 `ArrayType`
-:   container type to store arrays. It must be a vector-like container: the library uses `operator[]`, `at()`, and
-    `resize()`, and requires random-access iterators. `#!cpp std::vector` and `#!cpp std::deque` qualify;
-    `#!cpp std::list` does not. See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#arraytype) for the full list of
-    requirements.
+:   container type to store arrays (e.g., `std::vector` or `std::list`)

 `AllocatorType`
 :   the allocator to use for objects (e.g., `std::allocator`)
@@ -70,4 +66,3 @@ Arrays are stored as pointers in a `basic_json` type. That is, for any access to
 ## Version history

 - Added in version 1.0.0.
- Made `capacity()` optional, so that array types such as `#!cpp std::deque` can be used, in version 3.13.0.
@@ -82,13 +82,7 @@ basic_json(basic_json&& other) noexcept;
 4. This is a constructor for existing `basic_json` types. It does not hijack copy/move constructors, since the parameter
   has different template arguments than the current ones.

-    The constructor tries to convert the internal `m_value` of the parameter. Each member value (object, array, string,
-    etc.) is serialized via the corresponding `to_json()` overload. For objects and strings, the conversion requires
-    that the *target* `basic_json` type's `object_t::key_type` (or `string_t`) be directly constructible from the
-    *source* type's corresponding member type via `is_constructible`. If this requirement is not met, the conversion
-    does not fail to compile; instead, it silently falls back to the array-conversion path, which represents objects
-    as arrays of `[key, value]` pairs and strings as arrays of character codes. This is a known limitation tracked in
-    [issue #3425](https://github.com/nlohmann/json/issues/3425).
+    The constructor tries to convert the internal `m_value` of the parameter.

 5. Creates a JSON value of type array or object from the passed initializer list `init`. In case `type_deduction` is
   `#!cpp true` (default), the type of the JSON value to be created is deducted from the initializer list `init`
@@ -115,22 +109,7 @@ basic_json(basic_json&& other) noexcept;
   
    Function [`array()`](array.md) and [`object()`](object.md) force array and object creation from initializer lists,
    respectively.
-
-    !!! warning "Brace initialization yields arrays"
-
-        Because this constructor takes an `initializer_list_t`, brace-initializing a `json`/`ordered_json` from
-        another `json` value wraps it in a single-element array rather than copying it:
-
-        ```cpp
-        json j1 = "hello";
-        json j2{j1};   // [!] j2 is ["hello"], NOT a copy of j1
-        json j3(j1);   // j3 is "hello" -- parentheses copy as expected
-        ```
-
-        See the FAQ entry on [brace initialization](../../home/faq.md#brace-initialization-yields-arrays) for the
-        full explanation, an opt-in macro to change this behavior, and how to explicitly create a single-element
-        array (`json::array({value})`) if that is what you want.
-
+        
 6. Constructs a JSON array value by creating `cnt` copies of a passed value. In case `cnt` is `0`, an empty array is
   created.

@@ -167,11 +146,6 @@ basic_json(basic_json&& other) noexcept;

    - `BasicJsonType` is a `basic_json` type.
    - `BasicJsonType` has different template arguments than `basic_json_t`.
-    
-    **Note:** For cross-`basic_json` conversions to produce correct results, the target `basic_json`'s
-    `object_t::key_type` and `string_t` must be directly constructible from the source `basic_json`'s
-    corresponding types. See the description of overload (4) above for details on what happens when
-    this requirement is not met.

 `U`:
 :   `uncvref_t<CompatibleType>`
@@ -13,8 +13,9 @@ is compatible with both of the binary data formats that use binary subtyping, (t
 incompatible with each other, and it is up to the user to translate between them). The subtype is added to `BinaryType`
 via the helper type [byte_container_with_subtype](../byte_container_with_subtype/index.md).

-[CBOR's RFC 8949](https://www.rfc-editor.org/rfc/rfc8949.html#section-3.1) describes this type as:
-> Major type 2: A byte string. The number of bytes in the string is equal to the argument.
+[CBOR's RFC 7049](https://tools.ietf.org/html/rfc7049) describes this type as:
+> Major type 2: a byte string. The string's length in bytes is represented following the rules for positive integers
+> (major type 0).

 [MessagePack's documentation on the bin type
 family](https://github.com/msgpack/msgpack/blob/master/spec.md#bin-format-family) describes this type as:
@@ -36,59 +37,12 @@ represent a byte array in modern C++.
 `BinaryType`
 :   container type to store arrays

-    Although not formally expressed as a C++ concept, `BinaryType` must be default-constructible,
-    copy/move-constructible, and support `push_back()`, `.data()`, and `.size()`, because
-    [`byte_container_with_subtype`](../byte_container_with_subtype/index.md) derives directly from it. Its
-    `value_type` must additionally be exactly one byte wide (e.g., `std::uint8_t`/`char`/`std::byte`): the binary
-    serializers (CBOR, MessagePack, BSON, UBJSON) read and write the container's raw bytes via
-    `reinterpret_cast`, which is only correct for byte-sized elements -- a container like
-    `#!cpp std::vector<std::intptr_t>` will not work as `BinaryType`. The elements must be stored contiguously, and
-    the binary readers additionally require `resize()` and `operator[]`. See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#binarytype) for the full list.
-
 ## Notes

 #### Default type

 The default values for `BinaryType` is `#!cpp std::vector<std::uint8_t>`.

-#### Supported byte types
-
-`#!cpp std::vector<std::uint8_t>`, `#!cpp std::vector<char>`, and `#!cpp std::vector<std::byte>` are supported.
-Regardless of which of them is configured, [`dump`](dump.md) writes the bytes as the numbers 0..255.
-
-#### Custom BinaryType behavior
-
-When a custom `BinaryType` is configured (other than the default `#!cpp std::vector<std::uint8_t>`), you can assign
-values of that type directly to a `basic_json` instance, and they will automatically be recognized as binary values
-rather than arrays:
-
-```cpp
-using custom_json = nlohmann::basic_json<
-    nlohmann::ordered_map,  // ObjectType
-    std::vector,            // ArrayType
-    std::string,            // StringType
-    bool,                   // BooleanType
-    std::int64_t,           // NumberIntegerType
-    std::uint64_t,          // NumberUnsignedType
-    double,                 // NumberFloatType
-    std::allocator,         // AllocatorType
-    nlohmann::adl_serializer,
-    std::vector<std::byte>  // Custom BinaryType
->;
-
-std::vector<std::byte> data{std::byte{1}, std::byte{2}, std::byte{3}};
-custom_json j = data;  // Creates a binary value, not an array
-assert(j.is_binary());
-
-// Round-tripping works seamlessly
-auto extracted = j.get<std::vector<std::byte>>();
-assert(extracted == data);
-```
-
-This automatic type detection is a convenience feature that only applies to custom (non-default) `BinaryType` configurations.
-The default `nlohmann::json` continues to treat `#!cpp std::vector<std::uint8_t>` as arrays for backward compatibility.
-
 #### Storage

 Binary Arrays are stored as pointers in a `basic_json` type. That is, for any access to array values, a pointer of the
@@ -133,6 +87,3 @@ type `#!cpp binary_t*` must be dereferenced.
 ## Version history

 - Added in version 3.8.0. Changed the type of subtype to `std::uint64_t` in version 3.10.0.
- Fixed [`dump`](dump.md), [`std::hash`](std_hash.md), and [`to_ubjson`](to_ubjson.md) for byte types that are not
-  integers (e.g., `#!cpp std::byte`) in version 3.13.0. `dump` now writes the bytes of a signed byte type (e.g.,
-  `#!cpp char`) as 0..255 rather than as negative numbers.
@@ -11,14 +11,6 @@ literals `#!json true` and `#!json false`.

 To store boolean values in C++, a type is defined by the template parameter  `BooleanType` which chooses the type to use.

-## Template parameters
-
-`BooleanType`
-:   the type to store booleans. As it is stored directly inside a `basic_json` value (in a union), it must be a
-    trivially default-constructible, trivially copyable, and trivially destructible type that is convertible to and
-    from `#!cpp bool`. See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#booleantype).
-
 ## Notes

 #### Default type
@@ -18,7 +18,7 @@ ignore
 :   ignore tags

 store
-:   store tagged byte strings (for bytes 0xd8..0xdb) as binary values with the tag as subtype; other tagged values are read as if the tag were ignored. If several tags precede a byte string, only the innermost one is stored.
+:   store tagged values as binary container with subtype (for bytes 0xd8..0xdb)

 ## Examples

@@ -43,17 +43,6 @@ Strong guarantee: if an exception is thrown, there are no changes to any JSON va
 Throws [`type_error.316`](../../home/exceptions.md#jsonexceptiontype_error316) if a string stored inside the JSON value
 is not UTF-8 encoded and `error_handler` is set to `strict`

-!!! warning "Serializing untrusted input"
-
-    When serializing values that may contain invalid or untrusted UTF-8 (e.g., bytes taken directly from network
-    input), `dump()` throws [`type_error.316`](../../home/exceptions.md#jsonexceptiontype_error316) in the default
-    `strict` mode. To serialize such data without throwing, pass
-    [`error_handler_t::replace`](error_handler_t.md) (substitutes U+FFFD) or
-    [`error_handler_t::ignore`](error_handler_t.md). Callers that serialize untrusted input on a crash-sensitive path
-    should either choose a non-strict error handler or wrap `dump()` in a `#!cpp try`/`#!cpp catch`.
-
-    See the [FAQ](../../home/faq.md#serializing-untrusted-or-invalid-utf-8) for details.
-
 ## Complexity

 Linear.
@@ -92,4 +92,4 @@ std::string format_as(const BasicJsonType& j)

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -7,8 +7,8 @@ static basic_json from_bjdata(InputType&& i,
                              const bool strict = true,
                              const bool allow_exceptions = true);
 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json from_bjdata(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static basic_json from_bjdata(IteratorType first, IteratorType last,
                              const bool strict = true,
                              const bool allow_exceptions = true);
 ```
@@ -16,7 +16,7 @@ static basic_json from_bjdata(IteratorType first, SentinelType last,
 Deserializes a given input to a JSON value using the BJData (Binary JData) serialization format.

 1. Reads from a compatible input.
-2. Reads from an iterator range, or an iterator and a sentinel of a different type (C++20 ranges support).
+2. Reads from an iterator range.

 The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bjdata.md).

@@ -29,18 +29,11 @@ The exact mapping and its limitations are described on a [dedicated page](../../
    - a `FILE` pointer
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -50,7 +43,7 @@ The exact mapping and its limitations are described on a [dedicated page](../../
 :   iterator to the start of the input

 `last` (in)
-:   iterator to the end of the input, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of the input

 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -104,10 +97,7 @@ Linear in the size of the input.
 - [from_msgpack](from_msgpack.md) create a JSON value from an input in MessagePack format
 - [from_bson](from_bson.md) create a JSON value from an input in BSON format
 - [from_ubjson](from_ubjson.md) create a JSON value from an input in UBJSON format
- [from_bon8](from_bon8.md) create a JSON value from an input in BON8 format

 ## Version history

 - Added in version 3.11.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
@@ -1,108 +0,0 @@
-# <small>nlohmann::basic_json::</small>from_bon8
-
-```cpp
-// (1)
-template<typename InputType>
-static basic_json from_bon8(InputType&& i,
-                            const bool strict = true,
-                            const bool allow_exceptions = true);
-// (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json from_bon8(IteratorType first, SentinelType last,
-                            const bool strict = true,
-                            const bool allow_exceptions = true);
-```
-
-Deserializes a given input to a JSON value using the BON8 (Binary Object Notation 8) serialization format.
-
-1. Reads from a compatible input.
-2. Reads from an iterator range, or an iterator and a sentinel of a different type (C++20 ranges support).
-
-The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bon8.md).
-
-## Template parameters
-
-`InputType`
-:   A compatible input, for instance:
-
-    - an `std::istream` object
-    - a `FILE` pointer
-    - a C-style array of characters
-    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
-
-`IteratorType`
-:   a compatible iterator type
-
-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
-## Parameters
-
-`i` (in)
-:   an input in BON8 format convertible to an input adapter
-
-`first` (in)
-:   iterator to the start of the input
-
-`last` (in)
-:   iterator to the end of the input, or a sentinel value that compares equal to the end iterator with `operator!=`
-
-`strict` (in)
-:   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
-
-`allow_exceptions` (in)
-:   whether to throw exceptions in case of a parse error (optional, `#!cpp true` by default)
-
-## Return value
-
-deserialized JSON value; in case of a parse error and `allow_exceptions` set to `#!cpp false`, the return value will be
-`value_t::discarded`. The latter can be checked with [`is_discarded`](is_discarded.md).
-
-## Exception safety
-
-Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
-
-## Exceptions
-
- Throws [parse_error.110](../../home/exceptions.md#jsonexceptionparse_error110) if the given input ends prematurely or
-  the end of the file was not reached when `strict` was set to true
- Throws [parse_error.112](../../home/exceptions.md#jsonexceptionparse_error112) if a parse error occurs, for instance
-  an invalid byte, a string that is not valid UTF-8, or an object key that is not a string
-
-## Complexity
-
-Linear in the size of the input.
-
-## Examples
-
-??? example
-
-    The example shows the deserialization of a byte vector in BON8 format to a JSON value.
-     
-    ```cpp
-    --8<-- "examples/from_bon8.cpp"
-    ```
-    
-    Output:
-    
-    ```json
-    --8<-- "examples/from_bon8.output"
-    ```
-
-## See also
-
- [to_bon8](to_bon8.md) create a BON8 serialization of a JSON value
- [from_cbor](from_cbor.md) create a JSON value from an input in CBOR format
- [from_msgpack](from_msgpack.md) create a JSON value from an input in MessagePack format
- [from_bson](from_bson.md) create a JSON value from an input in BSON format
- [from_ubjson](from_ubjson.md) create a JSON value from an input in UBJSON format
- [from_bjdata](from_bjdata.md) create a JSON value from an input in BJData format
-
-## Version history
-
- Added in version 3.13.0.
@@ -7,8 +7,8 @@ static basic_json from_bson(InputType&& i,
                            const bool strict = true,
                            const bool allow_exceptions = true);
 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json from_bson(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static basic_json from_bson(IteratorType first, IteratorType last,
                            const bool strict = true,
                            const bool allow_exceptions = true);
 ```
@@ -16,7 +16,7 @@ static basic_json from_bson(IteratorType first, SentinelType last,
 Deserializes a given input to a JSON value using the BSON (Binary JSON) serialization format.

 1. Reads from a compatible input.
-2. Reads from an iterator range, or an iterator and a sentinel of a different type (C++20 ranges support).
+2. Reads from an iterator range.

 The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bson.md).

@@ -29,18 +29,11 @@ The exact mapping and its limitations are described on a [dedicated page](../../
    - a `FILE` pointer
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -50,7 +43,7 @@ The exact mapping and its limitations are described on a [dedicated page](../../
 :   iterator to the start of the input

 `last` (in)
-:   iterator to the end of the input, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of the input

 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -104,13 +97,10 @@ Linear in the size of the input.
 - [from_msgpack](from_msgpack.md) for the related MessagePack format
 - [from_ubjson](from_ubjson.md) for the related UBJSON format
 - [from_bjdata](from_bjdata.md) for the related BJData format
- [from_bon8](from_bon8.md) for the related BON8 format

 ## Version history

 - Added in version 3.4.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.

 !!! warning "Deprecation"

@@ -9,8 +9,8 @@ static basic_json from_cbor(InputType&& i,
                            const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);

 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json from_cbor(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static basic_json from_cbor(IteratorType first, IteratorType last,
                            const bool strict = true,
                            const bool allow_exceptions = true,
                            const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error);
@@ -19,7 +19,7 @@ static basic_json from_cbor(IteratorType first, SentinelType last,
 Deserializes a given input to a JSON value using the CBOR (Concise Binary Object Representation) serialization format.

 1. Reads from a compatible input.
-2. Reads from an iterator range, or an iterator and a sentinel of a different type (C++20 ranges support).
+2. Reads from an iterator range.

 The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/cbor.md).

@@ -32,18 +32,11 @@ The exact mapping and its limitations are described on a [dedicated page](../../
    - a `FILE` pointer
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -53,7 +46,7 @@ The exact mapping and its limitations are described on a [dedicated page](../../
 :   iterator to the start of the input

 `last` (in)
-:   iterator to the end of the input, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of the input

 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -110,7 +103,6 @@ Linear in the size of the input.
 - [from_bson](from_bson.md) create a JSON value from an input in BSON format
 - [from_ubjson](from_ubjson.md) create a JSON value from an input in UBJSON format
 - [from_bjdata](from_bjdata.md) create a JSON value from an input in BJData format
- [from_bon8](from_bon8.md) create a JSON value from an input in BON8 format

 ## Version history

@@ -119,8 +111,6 @@ Linear in the size of the input.
 - Changed to consume input adapters, removed `start_index` parameter, and added `strict` parameter in version 3.0.0.
 - Added `allow_exceptions` parameter in version 3.2.0.
 - Added `tag_handler` parameter in version 3.9.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.

 !!! warning "Deprecation"

@@ -7,8 +7,8 @@ static basic_json from_msgpack(InputType&& i,
                               const bool strict = true,
                               const bool allow_exceptions = true);
 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json from_msgpack(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static basic_json from_msgpack(IteratorType first, IteratorType last,
                               const bool strict = true,
                               const bool allow_exceptions = true);
 ```
@@ -16,7 +16,7 @@ static basic_json from_msgpack(IteratorType first, SentinelType last,
 Deserializes a given input to a JSON value using the MessagePack serialization format.

 1. Reads from a compatible input.
-2. Reads from an iterator range, or an iterator and a sentinel of a different type (C++20 ranges support).
+2. Reads from an iterator range.

 The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/messagepack.md).

@@ -29,18 +29,11 @@ The exact mapping and its limitations are described on a [dedicated page](../../
    - a `FILE` pointer
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -50,7 +43,7 @@ The exact mapping and its limitations are described on a [dedicated page](../../
 :   iterator to the start of the input

 `last` (in)
-:   iterator to the end of the input, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of the input

 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -103,7 +96,6 @@ Linear in the size of the input.
 - [from_bson](from_bson.md) create a JSON value from an input in BSON format
 - [from_ubjson](from_ubjson.md) create a JSON value from an input in UBJSON format
 - [from_bjdata](from_bjdata.md) create a JSON value from an input in BJData format
- [from_bon8](from_bon8.md) create a JSON value from an input in BON8 format

 ## Version history

@@ -111,8 +103,6 @@ Linear in the size of the input.
 - Parameter `start_index` since version 2.1.1.
 - Changed to consume input adapters, removed `start_index` parameter, and added `strict` parameter in version 3.0.0.
 - Added `allow_exceptions` parameter in version 3.2.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.

 !!! warning "Deprecation"

@@ -7,8 +7,8 @@ static basic_json from_ubjson(InputType&& i,
                              const bool strict = true,
                              const bool allow_exceptions = true);
 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json from_ubjson(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static basic_json from_ubjson(IteratorType first, IteratorType last,
                              const bool strict = true,
                              const bool allow_exceptions = true);
 ```
@@ -16,7 +16,7 @@ static basic_json from_ubjson(IteratorType first, SentinelType last,
 Deserializes a given input to a JSON value using the UBJSON (Universal Binary JSON) serialization format.

 1. Reads from a compatible input.
-2. Reads from an iterator range, or an iterator and a sentinel of a different type (C++20 ranges support).
+2. Reads from an iterator range.

 The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/ubjson.md).

@@ -29,18 +29,11 @@ The exact mapping and its limitations are described on a [dedicated page](../../
    - a `FILE` pointer
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -50,7 +43,7 @@ The exact mapping and its limitations are described on a [dedicated page](../../
 :   iterator to the start of the input

 `last` (in)
-:   iterator to the end of the input, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of the input

 `strict` (in)
 :   whether to expect the input to be consumed until EOF (`#!cpp true` by default)
@@ -104,14 +97,11 @@ Linear in the size of the input.
 - [from_msgpack](from_msgpack.md) create a JSON value from an input in MessagePack format
 - [from_bson](from_bson.md) create a JSON value from an input in BSON format
 - [from_bjdata](from_bjdata.md) create a JSON value from an input in BJData format
- [from_bon8](from_bon8.md) create a JSON value from an input in BON8 format

 ## Version history

 - Added in version 3.1.0.
 - Added `allow_exceptions` parameter in version 3.2.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.

 !!! warning "Deprecation"

@@ -114,13 +114,6 @@ overload (3).
    See [Number conversion](../../features/types/number_handling.md#number-conversion)
    for more information.

-!!! note "`std::optional` conversions"
-
-    Prior to version 3.13.0, `#!cpp get<std::optional<T>>()` (and other conversions to `std::optional<T>`) failed to
-    compile in every configuration, due to an internal implementation bug that made the `from_json` overload for
-    `std::optional` unreachable regardless of the [`JSON_USE_IMPLICIT_CONVERSIONS`](../macros/json_use_implicit_conversions.md)
-    setting. This has been fixed.
-
 ## Examples

 ??? example
@@ -21,10 +21,6 @@ This overload is chosen if:
 - `ValueType` is not `basic_json`,
 - `json_serializer<ValueType>` has a `from_json()` method of the form `void from_json(const basic_json&, ValueType&)`

-`v` must not be `const`. Passing a `const` object is a compile-time error. For types such as arithmetic types, enums,
-and C arrays, the error is a `static_assert` that names the problem. For other types, the overload is not viable, and
-the compiler reports that no matching `get_to` was found.
-
 ## Template parameters

 `ValueType`
@@ -71,4 +67,3 @@ Depends on the `json_serializer<ValueType>::from_json()` implementation.
 ## Version history

 - Since version 3.3.0.
- Added a `static_assert` with a clear message for `const` arguments in version 3.13.0.
@@ -35,10 +35,6 @@ class basic_json;
 | `BinaryType`         | type for binary arrays                                                    | [`binary_t`](binary_t.md)                   |
 | `CustomBaseClass`    | extension point for user code                                             | [`json_base_class_t`](json_base_class_t.md) |

-The library imposes a number of requirements on these types that are not expressed as C++ concepts, such as the
-container operations `object_t` and `array_t` must provide, or the fact that `StringType` must be `char`-based. They
-are collected in [Template Parameter Requirements](../../features/types/template_parameters.md).
-
 ## Specializations

 - [**json**](../json.md) - default specialization
@@ -290,13 +286,11 @@ Access to the JSON value
 ### Binary formats

 - [**from_bjdata**](from_bjdata.md) (_static_) - create a JSON value from an input in BJData format
- [**from_bon8**](from_bon8.md) (_static_) - create a JSON value from an input in BON8 format
 - [**from_bson**](from_bson.md) (_static_) - create a JSON value from an input in BSON format
 - [**from_cbor**](from_cbor.md) (_static_) - create a JSON value from an input in CBOR format
 - [**from_msgpack**](from_msgpack.md) (_static_) - create a JSON value from an input in MessagePack format
 - [**from_ubjson**](from_ubjson.md) (_static_) - create a JSON value from an input in UBJSON format
 - [**to_bjdata**](to_bjdata.md) (_static_) - create a BJData serialization of a given JSON value
- [**to_bon8**](to_bon8.md) (_static_) - create a BON8 serialization of a given JSON value
 - [**to_bson**](to_bson.md) (_static_) - create a BSON serialization of a given JSON value
 - [**to_cbor**](to_cbor.md) (_static_) - create a CBOR serialization of a given JSON value
 - [**to_msgpack**](to_msgpack.md) (_static_) - create a MessagePack serialization of a given JSON value
@@ -7,8 +7,7 @@ enum class input_format_t {
    msgpack,
    ubjson,
    bson,
-    bjdata,
-    bon8
+    bjdata
 };
 ```

@@ -32,9 +31,6 @@ bson
 bjdata
 :   BJData (Binary JData)

-bon8
-:   BON8 (Binary Object Notation 8)
-
 ## Examples

 ??? example
@@ -88,8 +88,6 @@ Strong exception safety: if an exception occurs, the original value stays intact
      do not belong to the same JSON value; example: `"iterators do not fit"`
    - Throws [`invalid_iterator.211`](../../home/exceptions.md#jsonexceptioninvalid_iterator211) if `first` or `last`
      are iterators into container for which insert is called; example: `"passed iterators may not belong to container"`
-    - Throws [`invalid_iterator.202`](../../home/exceptions.md#jsonexceptioninvalid_iterator202) if `first` or `last`
-      do not point to an array; example: `"iterators first and last must point to arrays"`
 4. The function can throw the following exceptions:
    - Throws [`type_error.309`](../../home/exceptions.md#jsonexceptiontype_error309) if called on JSON values other than
      arrays; example: `"cannot use insert() with string"`
@@ -46,17 +46,6 @@ for (auto& [key, val] : j_object.items())
 }
 ```

-If you need to name the type of the dereferenced element explicitly (e.g., to write a standalone function that
-takes it as a parameter, or to use `items()` with `std::for_each`), use `decltype`:
-
-```cpp
-using element_type = decltype(*j_object.items().begin());
-```
-
-The per-element type (`iteration_proxy_value`) lives in the library's internal `detail` namespace and is
-intentionally unspecified as a stable, named type -- `decltype` is the supported way to obtain it, but its exact
-name/definition may change between versions.
-
 ## Return value

 iteration proxy object wrapping the current value with an interface to use in range-based for loops
@@ -21,11 +21,8 @@ The default value for `CustomBaseClass` is `void`. In this case, an

 #### Limitations

-The type `CustomBaseClass` has to be a default-constructible, non-`final` class.
+The type `CustomBaseClass` has to be a default-constructible class.
 `basic_json` only supports copy/move construction/assignment if `CustomBaseClass` does so as well.
-A `CustomBaseClass` with non-static data members forfeits `basic_json`'s
-[standard layout](https://en.cppreference.com/w/cpp/named_req/StandardLayoutType) guarantee. See
-[Template Parameter Requirements](../../features/types/template_parameters.md#custombaseclass).

 ## Examples

@@ -19,12 +19,6 @@ using json_serializer = JSONSerializer<T, SFINAE>;

 The default values for `json_serializer` is [`adl_serializer`](../adl_serializer/index.md).

-#### Requirements
-
-A custom serializer must provide `#!cpp static void to_json(basic_json&, T)` for every type it serializes, and either
-`#!cpp static void from_json(const basic_json&, T&)` or `#!cpp static T from_json(const basic_json&)` for every type it
-deserializes. See [Template Parameter Requirements](../../features/types/template_parameters.md#jsonserializer).
-
 ## Examples

 ??? example
@@ -20,16 +20,6 @@ used.
 To store floating-point numbers in C++, a type is defined by the template parameter `NumberFloatType` which chooses the
 type to use.

-## Template parameters
-
-`NumberFloatType`
-:   the type to store floating-point numbers. Parsing and serialization are implemented in terms of
-    `#!cpp std::strtof`/`#!cpp std::strtod`/`#!cpp std::strtold` and `#!cpp std::snprintf`, so the type must be
-    `#!cpp float`, `#!cpp double`, or `#!cpp long double`. The
-    [binary formats](../../features/binary_formats/index.md) additionally require `#!cpp float` or `#!cpp double`,
-    because they have no encoding for `#!cpp long double`. See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#numberfloattype).
-
 ## Notes

 #### Default type
@@ -20,13 +20,6 @@ used.
 To store integer numbers in C++, a type is defined by the template parameter `NumberIntegerType` which chooses the type
 to use.

-## Template parameters
-
-`NumberIntegerType`
-:   the type to store signed integers. It must be a **signed integral** type (`#!cpp std::is_integral`) with a
-    `#!cpp std::numeric_limits` specialization, and it is stored directly inside a `basic_json` value. See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#numberintegertype-and-numberunsignedtype).
-
 ## Notes

 #### Default type
@@ -20,14 +20,6 @@ used.
 To store unsigned integer numbers in C++, a type is defined by the template parameter `NumberUnsignedType` which chooses
 the type to use.

-## Template parameters
-
-`NumberUnsignedType`
-:   the type to store unsigned integers. It must be an **unsigned integral** type (`#!cpp std::is_integral`) with a
-    `#!cpp std::numeric_limits` specialization, and it must be able to represent the absolute value of every
-    [`number_integer_t`](number_integer_t.md) value. See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#numberintegertype-and-numberunsignedtype).
-
 ## Notes

 #### Default type
@@ -30,5 +30,3 @@ and [`default_object_comparator_t`](default_object_comparator_t.md) otherwise.
 - Added in version 3.0.0.
 - Changed to be conditionally defined as `#!cpp typename object_t::key_compare` or `default_object_comparator_t` in
  version 3.11.0.
- Fixed the fallback to `default_object_comparator_t`, which previously failed to compile for object types without a
-  `key_compare` member type, in version 3.13.0.
@@ -18,11 +18,7 @@ To store objects in C++, a type is defined by the template parameters described
 ## Template parameters

 `ObjectType`
-:   the container to store objects. Its template parameters must have the same order and meaning as those of
-    `std::map`; in particular, the third parameter is a comparator. `#!cpp std::unordered_map`, whose third parameter
-    is a hash function, therefore needs an adapter -- see
-    [Template Parameter Requirements](../../features/types/template_parameters.md#objecttype) for the full list of
-    requirements, an adapter example, and the containers that are known to work.
+:   the container to store objects (e.g., `std::map` or `std::unordered_map`)

 `StringType`
 :   the type of the keys or names (e.g., `std::string`). The comparison function `std::less<StringType>` is used to
@@ -67,8 +63,7 @@ behavior:
  object will agree on the name-value mappings.
 - When the names within an object are not unique, it is unspecified which one of the values for a given key will be
  chosen. For instance, `#!json {"key": 2, "key": 1}` could be equal to either `#!json {"key": 1}` or
-  `#!json {"key": 2}`. To reject duplicate keys instead of silently resolving them one way or another, see
-  [this parsing recipe](../../features/parsing/parser_callbacks.md#recipe-rejecting-duplicate-object-keys).
+  `#!json {"key": 2}`.
 - Internally, name/value pairs are stored in lexicographical order of the names. Objects will also be serialized (see
  [`dump`](dump.md)) in this order. For instance, `#!json {"b": 1, "a": 2}` and `#!json {"a": 2, "b": 1}` will be stored
  and serialized as `#!json {"a": 2, "b": 1}`.
@@ -98,15 +93,6 @@ alphabetical order as `std::map` with `std::less` is used by default. Please not
 [RFC 8259](https://tools.ietf.org/html/rfc8259), because any order implements the specified "unordered" nature of JSON
 objects.

-#### Cross-`basic_json` conversion requirements
-
-When converting an object from one `basic_json` specialization to another via the
-[converting constructor](basic_json.md#overload-4), the target `object_t`'s `key_type` must be
-directly constructible from the source `basic_json`'s `string_t` type (or more generally, from the
-source object's key type). If this requirement is not met, the conversion does not fail; instead,
-the object is silently converted as an array of key-value pairs, which is incorrect. See
-[issue #3425](https://github.com/nlohmann/json/issues/3425) for details and an example.
-
 ## Examples

 ??? example
@@ -126,4 +112,3 @@ the object is silently converted as an array of key-value pairs, which is incorr
 ## Version history

 - Added in version 1.0.0.
- Allowed object types whose `erase(iterator)` returns `#!cpp void` in version 3.13.0.
@@ -124,15 +124,6 @@ Strong exception safety: if an exception occurs, the original value stays intact
      filled with `#!json null`.
    - The special value `-` is treated as a synonym for the index past the end.

-    !!! note "Creating intermediate levels that don't exist yet"
-
-        When the JSON pointer traverses intermediate levels that don't exist at all yet (not just a missing
-        leaf), each missing level is created as an array or an object depending on whether the corresponding
-        pointer token parses as a non-negative integer: a numeric token creates an array, a non-numeric token
-        creates an object. For example, on an initially `#!json null` value, `/foo/0/0/0` creates nested arrays,
-        while `/foo/one/one/one` creates nested objects. This is not specified by the JSON Pointer RFC; it is
-        this library's own, intentional disambiguation rule. See also [JSON Pointer](../../features/json_pointer.md).
-
 ## Examples

 ??? example "Example: (1) access specified array element"
@@ -260,6 +251,5 @@ Strong exception safety: if an exception occurs, the original value stays intact
 1. Added in version 1.0.0.
 2. Added in version 1.0.0. Added overloads for `T* key` in version 1.1.0. Removed overloads for `T* key` (replaced by 3)
   in version 3.11.0.
-3. Added in version 3.11.0. Fixed in version 3.13.0 to consistently accept `std::string_view`-convertible keys, as
-   already supported by [`at`](at.md), [`value`](value.md), [`find`](find.md), and other lookup functions.
+3. Added in version 3.11.0.
 4. Added in version 2.0.0.
@@ -19,8 +19,10 @@ class basic_json {
 };
 ```

-1. Compares two JSON values for inequality. Returns `#!cpp !(lhs == rhs)` (until C++20) or `#!cpp !(*this == rhs)` (since C++20).
-    - This means the comparison is simply the logical negation of `operator==`, including for special values like `NaN` and `discarded`.
+1. Compares two JSON values for inequality according to the following rules:
+    - The comparison always yields `#!cpp false` if (1) either operand is discarded, or (2) either operand is `NaN` and
+      the other operand is either `NaN` or any other number.
+    - Otherwise, returns the result of `#!cpp !(lhs == rhs)` (until C++20) or `#!cpp !(*this == rhs)` (since C++20).

 2. Compares a JSON value and a scalar or a scalar and a JSON value for inequality by converting the scalar to a JSON
   value and comparing both JSON values according to 1.
@@ -52,12 +54,13 @@ Linear.

 ## Notes

-!!! note "Comparing `NaN` and `discarded`"
+!!! note "Comparing `NaN`"

-    Since `operator!=` is defined as `!(a == b)`, the behavior for special values follows that of `operator==`:
-    
-    - For `NaN` values: `NaN == NaN` yields `#!cpp false`, so `NaN != NaN` yields `#!cpp true`.
-    - For `discarded` values: `discarded == x` yields `#!cpp false` for any `x`, so `discarded != x` yields `#!cpp true`.
+    `NaN` values are unordered within the domain of numbers.
+    The following comparisons all yield `#!cpp false`:
+      1. Comparing a `NaN` with itself.
+      2. Comparing a `NaN` with another `NaN`.
+      3. Comparing a `NaN` and any other number.

 ## Examples

@@ -91,7 +94,5 @@ Linear.

 ## Version history

-1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0. Changed in version 3.13.0 to remove 
-   special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`.
-2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0. Changed in version 3.13.0 to remove
-   special-casing for `NaN` and `discarded` values; `operator!=` now consistently means `!(a == b)`.
+1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
+2. Added in version 1.0.0. Added C++20 member functions in version 3.11.0.
@@ -10,8 +10,8 @@ static basic_json parse(InputType&& i,
                        const bool ignore_trailing_commas = false);

 // (2)
-template<typename IteratorType, typename SentinelType = IteratorType>
-static basic_json parse(IteratorType first, SentinelType last,
+template<typename IteratorType>
+static basic_json parse(IteratorType first, IteratorType last,
                        const parser_callback_t cb = nullptr,
                        const bool allow_exceptions = true,
                        const bool ignore_comments = false,
@@ -19,11 +19,10 @@ static basic_json parse(IteratorType first, SentinelType last,
 ```

 1. Deserialize from a compatible input.
-2. Deserialize from a pair of character iterators, or an iterator and a sentinel of a different type (C++20 ranges support)
+2. Deserialize from a pair of character iterators
    
    The `value_type` of the iterator must be an integral type with size of 1, 2, or 4 bytes, which will be interpreted
-    respectively as UTF-8, UTF-16, and UTF-32. If `SentinelType` differs from `IteratorType`, it must be comparable to
-    the iterator type with `operator!=`.
+    respectively as UTF-8, UTF-16, and UTF-32.

 ## Template parameters

@@ -35,8 +34,7 @@ static basic_json parse(IteratorType first, SentinelType last,
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters (throws if null)
    - a `std::string`
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of iterators.

 `IteratorType`
 :   a compatible iterator type, for instance.
@@ -44,12 +42,6 @@ static basic_json parse(IteratorType first, SentinelType last,
    - a pair of `std::string::iterator` or `std::vector<std::uint8_t>::iterator`
    - a pair of pointers such as `ptr` and `ptr + len`

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 ## Parameters

 `i` (in)
@@ -74,7 +66,7 @@ static basic_json parse(IteratorType first, SentinelType last,
 :   iterator to the start of a character range

 `last` (in)
-:   iterator to the end of a character range, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of a character range

 ## Return value

@@ -103,10 +95,6 @@ A UTF-8 byte order mark is silently ignored.
 Invalid Unicode escapes and unpaired surrogates in the input are reported as
 [`parse_error.101`](../../home/exceptions.md#jsonexceptionparse_error101) with a detailed message.

-By default, a `'\0'` (NUL) byte anywhere in the input is treated as end of input, rather than as an ordinary (and,
-outside of a string, invalid) byte; see the [FAQ entry](../../home/faq.md#nul-bytes-in-the-input) for details and the
-[`JSON_STRICT_NUL_HANDLING`](../macros/json_strict_nul_handling.md) macro to opt into rejecting it instead.
-
 ## Examples

 ??? example "Parsing from a character array"
@@ -240,8 +228,6 @@ outside of a string, invalid) byte; see the [FAQ entry](../../home/faq.md#nul-by
 - [accept](accept.md) - check if the input is valid JSON
 - [sax_parse](sax_parse.md) - parse input using the SAX interface
 - [operator>>](../operator_gtgt.md) - deserialize from stream
- [`JSON_STRICT_NUL_HANDLING`](../macros/json_strict_nul_handling.md) - opt in to rejecting a NUL byte in the input
-  instead of treating it as end of input

 ## Version history

@@ -249,11 +235,7 @@ outside of a string, invalid) byte; see the [FAQ entry](../../home/faq.md#nul-by
 - Overload for contiguous containers (1) added in version 2.0.3.
 - Ignoring comments via `ignore_comments` added in version 3.9.0.
 - Changed [runtime assertion](../../features/assertions.md) in case of `FILE*` null pointers to exception in version 3.12.0.
- Added `ignore_trailing_commas` in version 3.13.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- `JSON_STRICT_NUL_HANDLING` added in version 3.13.0 to optionally reject a NUL byte in the input instead of treating
-  it as end of input; planned to become the default in version 4.0.0.
+- Added `ignore_trailing_commas` in version 3.12.x.

 !!! warning "Deprecation"

@@ -5,7 +5,7 @@ class parse_error : public exception;
 ```

 The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of
-JSON text, BJData, BON8, BSON, CBOR, MessagePack, UBJSON, as well as when using JSON Patch.
+JSON text, BSON, CBOR, MessagePack, UBJSON, as well as when using JSON Patch.

 Member `byte` holds the byte index of the last read character in the input file (see note below).

@@ -29,14 +29,7 @@ Discarding a value (i.e., returning `#!cpp false`) has different effects dependi
 called:

 - Discarded values in structured types are skipped. That is, the parser will behave as if the discarded value was never
-  read. This holds for every value type and for both kinds of parent: a discarded element is removed from the
-  surrounding array, and a discarded member is removed from the surrounding object together with its key.
- Arrays and objects can be discarded either at their `parse_event_t::array_start`/`parse_event_t::object_start` event
-  or at their `parse_event_t::array_end`/`parse_event_t::object_end` event, and both remove the whole value. Discarding
-  it at the start event also means the callback is called neither for the content of the value nor for its matching end
-  event.
- Discarding a `parse_event_t::key` event discards the whole object member. The callback is still called for the
-  associated value, but its return value has no further effect.
+  read.
 - In case a value outside a structured type is skipped, it is replaced with `null`. This case happens if the top-level
  element is skipped.

@@ -56,7 +49,7 @@ called:
 ## Return value

 Whether the JSON value which called the function during parsing should be kept (`#!cpp true`) or not (`#!cpp false`). In
-the latter case, it is skipped completely, or replaced by `null` if it is the top-level value.
+the latter case, it is either skipped completely or replaced by an empty discarded object.

 ## Examples

@@ -75,21 +68,6 @@ the latter case, it is skipped completely, or replaced by `null` if it is the to
    --8<-- "examples/parse__string__parser_callback_t.output"
    ```

-??? example
-
-    The example below shows where discarded values are removed. The array and the number are discarded in different
-    ways, but in each case the parse result contains neither the value nor its key.
-
-    ```cpp
-    --8<-- "examples/parser_callback_t.cpp"
-    ```
-
-    Output:
-
-    ```json
-    --8<-- "examples/parser_callback_t.output"
-    ```
-
 ## See also

 - [parse](parse.md) deserialize from a compatible input
@@ -98,5 +76,3 @@ the latter case, it is skipped completely, or replaced by `null` if it is the to
 ## Version history

 - Added in version 1.0.0.
- Fixed in version 3.13.0 to also remove discarded values from a parent object; before, discarding an array or a value
-  stored under an object key left a discarded member behind, which made the parse result serialize to invalid JSON.
@@ -34,10 +34,6 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
  ("add", "remove", "move")
 - Throws [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) if an "add" operation's target
  location has a parent that is neither an object nor an array.
- Throws [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) if a "remove" operation's target
-  location has a parent that is neither an object nor an array.
- Throws [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) if a "move" operation's "from"
-  location is a proper prefix of its "path" location.
 - Throws [`other_error.501`](../../home/exceptions.md#jsonexceptionother_error501) if "test" operation was
  unsuccessful.

@@ -78,8 +74,4 @@ is thrown. In any case, the original value is not changed: the patch is applied

 - Added in version 2.0.0.
 - Added [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's
-  target location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target
-  location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper
-  prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0.
+  target location has a non-object/non-array parent in version 3.12.x.
@@ -30,10 +30,6 @@ No guarantees, value may be corrupted by an unsuccessful patch operation.
  ("add", "remove", "move")
 - Throws [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) if an "add" operation's target
  location has a parent that is neither an object nor an array.
- Throws [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) if a "remove" operation's target
-  location has a parent that is neither an object nor an array.
- Throws [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) if a "move" operation's "from"
-  location is a proper prefix of its "path" location.
 - Throws [`other_error.501`](../../home/exceptions.md#jsonexceptionother_error501) if "test" operation was
  unsuccessful.

@@ -75,8 +71,4 @@ function throws an exception.

 - Added in version 3.11.0.
 - Added [`out_of_range.411`](../../home/exceptions.md#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's
-  target location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.413`](../../home/exceptions.md#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target
-  location has a non-object/non-array parent in version 3.13.0.
- Added [`out_of_range.414`](../../home/exceptions.md#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper
-  prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0.
+  target location has a non-object/non-array parent in version 3.12.x.
@@ -11,8 +11,8 @@ static bool sax_parse(InputType&& i,
                      const bool ignore_trailing_commas = false);

 // (2)
-template<class IteratorType, class SAX, class SentinelType = IteratorType>
-static bool sax_parse(IteratorType first, SentinelType last,
+template<class IteratorType, class SAX>
+static bool sax_parse(IteratorType first, IteratorType last,
                      SAX* sax,
                      input_format_t format = input_format_t::json,
                      const bool strict = true,
@@ -23,11 +23,10 @@ static bool sax_parse(IteratorType first, SentinelType last,
 Read from input and generate SAX events

 1. Read from a compatible input.
-2. Read from a pair of character iterators, or an iterator and a sentinel of a different type (C++20 ranges support)
+2. Read from a pair of character iterators
    
    The value_type of the iterator must be an integral type with a size of 1, 2, or 4 bytes, which will be interpreted
-    respectively as UTF-8, UTF-16, and UTF-32. If `SentinelType` differs from `IteratorType`, it must be comparable to
-    the iterator type with `operator!=`.
+    respectively as UTF-8, UTF-16, and UTF-32.

 The SAX event lister must follow the interface of [`json_sax`](../json_sax/index.md).

@@ -40,19 +39,13 @@ The SAX event lister must follow the interface of [`json_sax`](../json_sax/index
    - a `FILE` pointer
    - a C-style array of characters
    - a pointer to a null-terminated string of single byte characters
-    - a container `obj` for which `begin(obj)` and `end(obj)` produce a valid pair of iterators
-      (as found via ADL or member functions, with semantics compatible to `std::begin` and `std::end`)
+    - an object `obj` for which `begin(obj)` and `end(obj)` produces a valid pair of
+      iterators.

 `IteratorType`
 :   a compatible iterator type for overload (2); a pair of character iterators whose `value_type` is an integral type
    with a size of 1, 2, or 4 bytes (interpreted respectively as UTF-8, UTF-16, and UTF-32)

-`SentinelType`
-:   defaults to `IteratorType`; may be a different type comparable to `IteratorType` via `operator!=`, for overload (2), for instance.
-
-    - a custom sentinel type for C++20 ranges
-    - `std::default_sentinel_t`, when `IteratorType` is `std::counted_iterator`
-
 `SAX`
 :   a class fulfilling the SAX event listener interface; see [`json_sax`](../json_sax/index.md)

@@ -65,14 +58,11 @@ The SAX event lister must follow the interface of [`json_sax`](../json_sax/index
 :   SAX event listener (must not be null)

 `format` (in)
-:    the format to parse (JSON, BJData, BON8, BSON, CBOR, MessagePack, or UBJSON) (optional, `input_format_t::json` by
-     default), see
+:    the format to parse (JSON, CBOR, MessagePack, or UBJSON) (optional, `input_format_t::json` by default), see
     [`input_format_t`](input_format_t.md) for more information

 `strict` (in)
-:   whether the input has to be consumed completely (optional, `#!cpp true` by default); when `#!cpp false` and the
-    input is a `#!cpp std::istream`, the character that terminates a number is consumed unless
-    [`JSON_PRECISE_STREAM_POSITION`](../macros/json_precise_stream_position.md) is defined to `1`; see [`operator>>`](../operator_gtgt.md#notes)
+:   whether the input has to be consumed completely (optional, `#!cpp true` by default)

 `ignore_comments` (in)
 :   whether comments should be ignored and treated like whitespace (`#!cpp true`) or yield a parse error
@@ -86,7 +76,7 @@ The SAX event lister must follow the interface of [`json_sax`](../json_sax/index
 :   iterator to the start of a character range

 `last` (in)
-:   iterator to the end of a character range, or a sentinel value that compares equal to the end iterator with `operator!=`
+:   iterator to the end of a character range

 ## Return value

@@ -136,11 +126,7 @@ A UTF-8 byte order mark is silently ignored.

 - Added in version 3.2.0.
 - Ignoring comments via `ignore_comments` added in version 3.9.0.
- Added `ignore_trailing_commas` in version 3.13.0.
- Extended container support (1) to include types with lvalue-only ADL `begin`/`end` (matching `std::begin`/`std::end` semantics) in version 3.13.0.
- Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0.
- `JSON_PRECISE_STREAM_POSITION` added in version 3.13.0 to optionally leave a `#!cpp std::istream` positioned right
-  after the parsed value when `strict` is `#!cpp false`.
+- Added `ignore_trailing_commas` in version 3.12.x.

 !!! warning "Deprecation"

@@ -54,4 +54,4 @@ provides `<format>`, controlled by the [`JSON_HAS_STD_FORMAT`](../macros/json_ha

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -18,16 +18,6 @@ JSON class into byte-sized characters during deserialization.
 :   the container to store strings (e.g., `std::string`). Note this container is used for keys/names in objects, see
    [object_t](object_t.md).

-    `StringType` must have a `char`-compatible `value_type`: the library relies on UTF-8/`char`-based storage and
-    processing internally, so `std::wstring`, `std::u16string`, and `std::u32string` are **not** valid choices for
-    `StringType`. To work with wide-character data, convert it to/from UTF-8 at the boundary instead -- see the
-    FAQ's [wide string handling](../../home/faq.md#wide-string-handling) section for a conversion recipe.
-
-    Beyond the character type, the library expects a substantial part of the `#!cpp std::string` interface (contiguous
-    null-terminated `data()`, `substr()`, `find()`, `append()`, ...). See
-    [Template Parameter Requirements](../../features/types/template_parameters.md#stringtype) for the full list and
-    for the string types that are known to work.
-
 ## Notes

 #### Default type
@@ -55,15 +45,6 @@ This implementation is interoperable as it does compare strings code unit by cod
 String values are stored as pointers in a `basic_json` type. That is, for any access to string values, a pointer of type
 `string_t*` must be dereferenced.

-#### Cross-`basic_json` conversion requirements
-
-When converting a string value from one `basic_json` specialization to another via the
-[converting constructor](basic_json.md#overload-4), the target `string_t` must be directly
-constructible from the source `basic_json`'s `string_t` type. If this requirement is not met, the
-conversion does not fail; instead, the string is silently converted as an array of character codes,
-which is incorrect. See [issue #3425](https://github.com/nlohmann/json/issues/3425) for details
-and an example.
-
 ## Examples

 ??? example
@@ -83,5 +64,3 @@ and an example.
 ## Version history

 - Added in version 1.0.0.
- Removed the requirement that `string_t` be implicitly convertible from `#!cpp std::string`, which the BSON writer and
-  the UBJSON reader relied on, in version 3.13.0.
@@ -34,14 +34,10 @@ void swap(typename binary_t::container_type& other);
 ```

 1. Exchanges the contents of the JSON value with those of `other`. Does not invoke any move, copy, or swap operations on
-   individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. If macro
-   [`JSON_DIAGNOSTIC_POSITIONS`](../macros/json_diagnostic_positions.md) is defined to `#!cpp 1`, the
-   [`start_pos()`](start_pos.md)/[`end_pos()`](end_pos.md) diagnostic positions are exchanged along with the value.
+   individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. 
 2. Exchanges the contents of the JSON value from `left` with those of `right`. Does not invoke any move, copy, or swap
   operations on individual elements. All iterators and references remain valid. The past-the-end iterator is
-   invalidated. Implemented as a friend function callable via ADL. If macro
-   [`JSON_DIAGNOSTIC_POSITIONS`](../macros/json_diagnostic_positions.md) is defined to `#!cpp 1`, the
-   [`start_pos()`](start_pos.md)/[`end_pos()`](end_pos.md) diagnostic positions are exchanged along with the value.
+   invalidated. Implemented as a friend function callable via ADL.
 3. Exchanges the contents of a JSON array with those of `other`. Does not invoke any move, copy, or swap operations on
   individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated. 
 4. Exchanges the contents of a JSON object with those of `other`. Does not invoke any move, copy, or swap operations on
@@ -52,11 +52,6 @@ optional, `#!cpp bjdata_version_t::draft2` by default.

 Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

-## Exceptions
-
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
-  is false.
-
 ## Complexity

 Linear in the size of the JSON value `j`.
@@ -84,7 +79,6 @@ Linear in the size of the JSON value `j`.
 - [to_msgpack](to_msgpack.md) create a MessagePack serialization of a JSON value
 - [to_bson](to_bson.md) create a BSON serialization of a JSON value
 - [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
- [to_bon8](to_bon8.md) create a BON8 serialization of a JSON value

 ## Version history

@@ -1,76 +0,0 @@
-# <small>nlohmann::basic_json::</small>to_bon8
-
-```cpp
-// (1)
-static std::vector<std::uint8_t> to_bon8(const basic_json& j);
-
-// (2)
-static void to_bon8(const basic_json& j, detail::output_adapter<std::uint8_t> o);
-static void to_bon8(const basic_json& j, detail::output_adapter<char> o);
-```
-
-Serializes a given JSON value `j` to a byte vector using the BON8 (Binary Object Notation 8) serialization format. BON8
-is a compact binary serialization format that stores strings as UTF-8 without a length prefix.
-
-1. Returns a byte vector containing the BON8 serialization.
-2. Writes the BON8 serialization to an output adapter.
-
-The exact mapping and its limitations are described on a [dedicated page](../../features/binary_formats/bon8.md).
-
-## Parameters
-
-`j` (in)
-:   JSON value to serialize
-
-`o` (in)
-:   output adapter to write serialization to
-
-## Return value
-
-1. BON8 serialization as a byte vector
-2. (none)
-
-## Exception safety
-
-Strong guarantee: if an exception is thrown, there are no changes in the JSON value `j`, which is never modified.
-With (2), the bytes written before the exception remain in the output adapter.
-
-## Exceptions
-
- Throws [out_of_range.407](../../home/exceptions.md#jsonexceptionout_of_range407) if `j` contains an unsigned integer
-  above 9223372036854775807, which BON8 cannot represent
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if `j` contains a string that is not
-  valid UTF-8
-
-## Complexity
-
-Linear in the size of the JSON value `j`.
-
-## Examples
-
-??? example
-
-    The example shows the serialization of a JSON value to a byte vector in BON8 format.
-     
-    ```cpp
-    --8<-- "examples/to_bon8.cpp"
-    ```
-    
-    Output:
-    
-    ```json
-    --8<-- "examples/to_bon8.output"
-    ```
-
-## See also
-
- [from_bon8](from_bon8.md) create a JSON value from an input in BON8 format
- [to_cbor](to_cbor.md) create a CBOR serialization of a JSON value
- [to_msgpack](to_msgpack.md) create a MessagePack serialization of a JSON value
- [to_bson](to_bson.md) create a BSON serialization of a JSON value
- [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
- [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
-
-## Version history
-
- Added in version 3.13.0.
@@ -40,14 +40,10 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
  is not an object; example: `"to serialize to BSON, top-level type must be object, but is string"`
 - Throws [`out_of_range.409`](../../home/exceptions.md#jsonexceptionout_of_range409) if a key in the JSON object contains
  a null byte (code point U+0000); example: `"BSON key cannot contain code point U+0000 (at byte 2)"`
- Throws [`out_of_range.412`](../../home/exceptions.md#jsonexceptionout_of_range412) if the length of a document, array,
-  string, or binary value exceeds the range of the 32-bit BSON length field; example:
-  `"BSON length 2147483661 exceeds maximum of 2147483647"`

 ## Complexity

-Linear in the size of the JSON value `j`. The length prefixes of all nested documents and arrays are computed in one
-pass before anything is written.
+Linear in the size of the JSON value `j`.

 ## Examples

@@ -72,9 +68,7 @@ pass before anything is written.
 - [to_msgpack](to_msgpack.md) create a MessagePack serialization of a JSON value
 - [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
 - [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
- [to_bon8](to_bon8.md) create a BON8 serialization of a JSON value

 ## Version history

 - Added in version 3.4.0.
- Linear in the size of `j`, and no longer limited by the call stack for deeply nested values, since version 3.13.0.
@@ -62,7 +62,6 @@ Linear in the size of the JSON value `j`.
 - [to_bson](to_bson.md) create a BSON serialization of a JSON value
 - [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
 - [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
- [to_bon8](to_bon8.md) create a BON8 serialization of a JSON value

 ## Version history

@@ -34,15 +34,6 @@ The exact mapping and its limitations are described on a [dedicated page](../../

 Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

-## Exceptions
-
- Throws [`out_of_range.412`](../../home/exceptions.md#jsonexceptionout_of_range412) if the length of a string, binary
-  value, array, or object exceeds 4294967295, the maximum MessagePack can store; example:
-  `"MessagePack length 4294967296 exceeds maximum of 4294967295"`
- Throws [`out_of_range.415`](../../home/exceptions.md#jsonexceptionout_of_range415) if the subtype of a binary value
-  exceeds 255, the maximum of the MessagePack ext type; example:
-  `"subtype 70000 is too large for the MessagePack ext type (max 255)"`
-
 ## Complexity

 Linear in the size of the JSON value `j`.
@@ -70,9 +61,7 @@ Linear in the size of the JSON value `j`.
 - [to_bson](to_bson.md) create a BSON serialization of a JSON value
 - [to_ubjson](to_ubjson.md) create a UBJSON serialization of a JSON value
 - [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
- [to_bon8](to_bon8.md) create a BON8 serialization of a JSON value

 ## Version history

 - Added in version 2.0.9.
- Throws `out_of_range.412` and `out_of_range.415` since version 3.13.0.
@@ -45,11 +45,6 @@ The exact mapping and its limitations are described on a [dedicated page](../../

 Strong guarantee: if an exception is thrown, there are no changes in the JSON value.

-## Exceptions
-
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
-  is false.
-
 ## Complexity

 Linear in the size of the JSON value `j`.
@@ -77,7 +72,6 @@ Linear in the size of the JSON value `j`.
 - [to_msgpack](to_msgpack.md) create a MessagePack serialization of a JSON value
 - [to_bson](to_bson.md) create a BSON serialization of a JSON value
 - [to_bjdata](to_bjdata.md) create a BJData serialization of a JSON value
- [to_bon8](to_bon8.md) create a BON8 serialization of a JSON value

 ## Version history

@@ -21,12 +21,6 @@ a string representation of the type ([`value_t`](value_t.md)):
 | array                                              | `"array"`     |
 | binary                                             | `"binary"`    |
 | discarded                                          | `"discarded"` |
-| invalid (corrupted value)                          | `"invalid"`   |
-
-!!! note "The \"invalid\" type"
-
-    The `"invalid"` return value indicates a corrupted JSON value — this can occur if an enum value falls outside the
-    range of valid `value_t` values. This is useful for diagnosing data corruption or internal errors.

 ## Exception safety

@@ -58,4 +52,3 @@ Constant.
 - Part of the public API version since 2.1.0.
 - Changed return value to `const char*` and added `noexcept` in version 3.0.0.
 - Added support for binary type in version 3.8.0.
- Added `"invalid"` return value for corrupted JSON values in version 3.13.0.
@@ -37,14 +37,7 @@ Linear in the size of the JSON value.
 ## Notes

 Empty objects and arrays are flattened by [`flatten()`](flatten.md) to `#!json null` values and cannot unflattened to
-their original type.
-
-A flattened array and a flattened object whose keys are array indices are indistinguishable, because both are
-described by the same JSON pointers. A value is therefore restored as an array if and only if one of its keys is the
-reference token `0`, and as an object otherwise: `#!json {"2": 1}` is restored unchanged, whereas `#!json {"0": 1}` is
-restored as `#!json [1]`. This decision does not depend on the order in which the flattened object is iterated.
-
-Apart from these two cases, for a JSON value `j`, the following is always true:
+their original type. Apart from this example, for a JSON value `j`, the following is always true:
 `#!cpp j == j.flatten().unflatten()`.

 ## Examples
@@ -70,4 +63,3 @@ Apart from these two cases, for a JSON value `j`, the following is always true:
 ## Version history

 - Added in version 2.0.0.
- Made the array/object decision independent of the object's iteration order in version 3.13.0.
@@ -17,8 +17,6 @@ ValueType value(const json_pointer& ptr,
                const ValueType& default_value) const;
 ```

-This is equivalent to Python's `dict.get(key, default)`.
-
 1. Returns either a copy of an object's element at the specified key `key` or a given default value if no element with
   key `key` exists.
   
@@ -186,6 +184,4 @@ changes to any JSON value.

 1. Added in version 1.0.0. Changed parameter `default_value` type from `const ValueType&` to `ValueType&&` in version 3.11.0.
 2. Added in version 3.11.0. Made `ValueType` the first template parameter in version 3.11.2.
-3. Added in version 2.0.2. Extended to work with arrays in version 3.13.0, including fixing an issue where resolving
-   `ptr` through an array unexpectedly threw `out_of_range` instead of returning the resolved element (or
-   `default_value`, as documented).
+3. Added in version 2.0.2. Extended to work with arrays in version 3.12.x.
@@ -36,4 +36,4 @@ Constant.

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -32,4 +32,4 @@ Linear in the number of reference tokens in the `json_pointer`.

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -35,4 +35,4 @@ Linear in the number of reference tokens in the `json_pointer`.

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -14,13 +14,6 @@ header. See also the [macro overview page](../../features/macros.md).
 - [**JSON_DIAGNOSTIC_POSITIONS**](json_diagnostic_positions.md) - access positions of elements
 - [**JSON_NOEXCEPTION**](json_noexception.md) - switch off exceptions

-## Parsing
-
- [**JSON_PRECISE_STREAM_POSITION**](json_precise_stream_position.md) - opt in to leaving an input stream positioned
-  right after a parsed number
- [**JSON_STRICT_NUL_HANDLING**](json_strict_nul_handling.md) - opt in to rejecting a NUL byte in the input instead of
-  treating it as end of input
-
 ## Language support

 - [**JSON_HAS_CPP_11**<br>**JSON_HAS_CPP_14**<br>**JSON_HAS_CPP_17**<br>**JSON_HAS_CPP_20**](json_has_cpp_11.md) - set supported C++ standard
@@ -29,10 +22,8 @@ header. See also the [macro overview page](../../features/macros.md).
 - [**JSON_HAS_STD_FORMAT**](json_has_std_format.md) - control `std::format`/`std::formatter` support
 - [**JSON_HAS_THREE_WAY_COMPARISON**](json_has_three_way_comparison.md) - control 3-way comparison support
 - [**JSON_NO_IO**](json_no_io.md) - switch off functions relying on certain C++ I/O headers
- [**JSON_NO_THREAD_LOCAL**](json_no_thread_local.md) - switch off the use of `thread_local` storage
 - [**JSON_SKIP_UNSUPPORTED_COMPILER_CHECK**](json_skip_unsupported_compiler_check.md) - do not warn about unsupported compilers
 - [**JSON_USE_GLOBAL_UDLS**](json_use_global_udls.md) - place user-defined string literals (UDLs) into the global namespace
- [**JSON_USE_SIMDUTF**](json_use_simdutf.md) - use the simdutf library to accelerate UTF-8 validation

 ## Library version

@@ -53,8 +44,6 @@ header. See also the [macro overview page](../../features/macros.md).
 - [**JSON_BRACE_INIT_COPY_SEMANTICS**](json_brace_init_copy_semantics.md) - opt in to copy/move semantics for single-element brace initialization
 - [**JSON_DISABLE_ENUM_SERIALIZATION**](json_disable_enum_serialization.md) - switch off default serialization/deserialization functions for enums
 - [**JSON_USE_IMPLICIT_CONVERSIONS**](json_use_implicit_conversions.md) - control implicit conversions
- [**JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS**](json_use_objects_for_enum_keyed_maps.md) - opt in to storing maps with enum
-  keys as objects

 ## Comparison behavior

@@ -38,28 +38,6 @@ The default value is `0` (disabled — existing behavior is preserved).

    This macro must be defined **before** including `<nlohmann/json.hpp>`. Defining it after the include has no effect.

-!!! warning "Applies to every single-element list"
-
-    The macro does not only affect a single JSON value in braces. **Any** single-element braced list is treated as its
-    element, so it no longer creates a one-element array:
-
-    ```cpp
-    json j1 = {1};       // 1, not [1]
-    json j2 = {"text"};  // "text", not ["text"]
-    json j3 = {{1, 2}};  // [1,2], not [[1,2]]
-    ```
-
-    Code that relies on these producing arrays must use `json::array()` instead (see below). Lists with more than one
-    element, and a single `[string, value]` pair such as `{{"key", "value"}}`, which still creates an object, are not
-    affected. The library's own conversions are not affected either: for example, `std::tuple<int>{5}` still becomes
-    `[5]`.
-
-!!! note "ABI compatibility"
-
-    The value of this macro is encoded in the [namespace](../../features/namespace.md) (tag `_bics`), resulting in
-    distinct symbol names. Translation units compiled with and without it can therefore be linked into the same program
-    without One Definition Rule (ODR) violations, but they cannot exchange instances of library types.
-
 !!! tip "Workaround without the macro"

    To explicitly create a single-element array without enabling this macro, use `json::array()`:
@@ -114,4 +92,4 @@ The default value is `0` (disabled — existing behavior is preserved).

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -38,8 +38,7 @@ When the macro is not defined, the library will define it to its default value.

    Diagnostic messages can also be controlled with the CMake option
    [`JSON_Diagnostics`](../../integration/cmake.md#json_diagnostics) (`OFF` by default)
-    which defines `JSON_DIAGNOSTICS` accordingly. Note this only applies when building the
-    library from source — see the pre-installed-package caveat on that page.
+    which defines `JSON_DIAGNOSTICS` accordingly.

 ## Examples

@@ -44,4 +44,4 @@ The default value is detected based on preprocessor macros such as `#!cpp __cplu

 - Added in version 3.10.5.
 - Added `JSON_HAS_CPP_23` in version 3.12.0.
- Added `JSON_HAS_CPP_26` in version 3.13.0.
+- Added `JSON_HAS_CPP_26` in version 3.12.x.
@@ -19,20 +19,6 @@ The default value is detected based on the preprocessor macros `#!cpp __cpp_lib_
 `#!cpp __cpp_lib_experimental_filesystem`, `#!cpp __has_include(<filesystem>)`, or
 `#!cpp __has_include(<experimental/filesystem>)`.

-!!! info "Known compiler/stdlib exclusions"
-
-    Even when the feature-test macro indicates filesystem support is available, the library disables it on the following broken toolchains:
-    
-    - **MinGW + GCC 8** — disabled entirely (broken `std::filesystem` implementation; [MinGW-w64 bug 737](https://sourceforge.net/p/mingw-w64/bugs/737/))
-    - **GCC (non-Clang) < 8** — disabled (no filesystem support)
-    - **Clang < 7** — disabled (no filesystem support)
-    - **MSVC < 19.14** — disabled (no filesystem support)
-    - **iOS < 13** — disabled (no filesystem support)
-    - **macOS < Catalina (10.15)** — disabled (no filesystem support)
-    
-    If `JSON_HAS_FILESYSTEM` or `JSON_HAS_EXPERIMENTAL_FILESYSTEM` is `0` despite `__cpp_lib_filesystem` being defined, one
-    of the exclusions above likely applies to your toolchain.
-
 ## Notes

 - Note that older compilers or older versions of libstdc++ also require the library `stdc++fs` to be linked to for
@@ -13,20 +13,6 @@ The default value is detected based on the preprocessor macro `#!cpp __cpp_lib_r

 When the macro is not defined, the library will define it to its default value.

-!!! info "Known compiler/stdlib exclusions"
-
-    Even when the feature-test macro `__cpp_lib_ranges` indicates ranges support is available, the library disables it on
-    the following incomplete or broken toolchains:
-    
-    - **GCC 11.1.0** — disabled (the shipped `<ranges>` header has a syntax error; [issue #4440](https://github.com/nlohmann/json/issues/4440))
-    - **libstdc++ < 11** — disabled (incomplete C++20 ranges support; [issue #4440](https://github.com/nlohmann/json/issues/4440))
-    - **Clang < 16 with libstdc++** — disabled (incomplete ranges support; [issue #4440](https://github.com/nlohmann/json/issues/4440))
-    - **libc++ < 160000** — disabled (incomplete C++20 ranges support; [issue #4440](https://github.com/nlohmann/json/issues/4440))
-    - **nvcc (CUDA) 12.0.x and 12.1.x** — disabled (the `enable_borrowed_range` variable-template syntax triggers a parse error
-      under these two toolkit versions; fixed in CUDA 12.2; [issue #3907](https://github.com/nlohmann/json/issues/3907))
-    
-    If `JSON_HAS_RANGES` is `0` despite `__cpp_lib_ranges` being defined, one of the exclusions above likely applies to your toolchain.
-
 ## Examples

 ??? example
@@ -38,4 +38,4 @@ When the macro is not defined, the library will define it to its default value.

 ## Version history

- Added in version 3.13.0.
+- Added in version 3.12.x.
@@ -1,48 +0,0 @@
-# JSON_NO_THREAD_LOCAL
-
-```cpp
-#define JSON_NO_THREAD_LOCAL
-```
-
-When defined, the library does not use `#!cpp thread_local` storage. This is relevant for the few environments whose
-toolchain does not support it.
-
-Copying a value and comparing two values both descend into the first levels by letting the containers copy or compare
-themselves, and finish whatever is nested deeper than that without the call stack, so that neither can exhaust the stack
-however deeply the values are nested. Each counts the levels it has descended into in a `#!cpp thread_local` variable, as
-a counter shared between threads would be raced.
-
-Without those counters, no descent can be bounded safely, so objects and arrays are copied and compared without the call
-stack right away. Both keep working exactly as they do otherwise - the same values come out, the same comparisons hold,
-and deeply nested values are handled just as safely - but both are slower, because the containers no longer copy or
-compare themselves. Copying the benchmark documents takes 9% (`canada.json`) to 34% (`twitter.json`) longer, and
-comparing two equal ones 10% (`citm_catalog.json`) to 90% (`canada.json`) longer.
-
-## Default definition
-
-By default, `#!cpp JSON_NO_THREAD_LOCAL` is not defined.
-
-```cpp
-#undef JSON_NO_THREAD_LOCAL
-```
-
-The library defines it by itself for Clang targeting MinGW, which does not survive the `#!cpp thread_local` storage:
-copying a value segfaults there, with both old and current Clang versions, while GCC targeting MinGW is unaffected.
-Copying and comparing fall back to working without the call stack there, as they do whenever the macro is defined.
-
-## Examples
-
-??? example
-
-    The code below forces the library not to use `#!cpp thread_local` storage.
-
-    ```cpp
-    #define JSON_NO_THREAD_LOCAL 1
-    #include <nlohmann/json.hpp>
-
-    ...
-    ```
-
-## Version history
-
- Added in version 3.12.1.
@@ -1,131 +0,0 @@
-# JSON_PRECISE_STREAM_POSITION
-
-```cpp
-#define JSON_PRECISE_STREAM_POSITION /* value */
-```
-
-When defined to `1`, [`operator>>`](../operator_gtgt.md) and [`sax_parse`](../basic_json/sax_parse.md) with
-`strict = false` leave a `#!cpp std::istream` positioned right after the parsed value for every value type. By default,
-the character that terminates a number is consumed as well.
-
-The macro only affects reading from a `#!cpp std::istream` when the rest of the stream is not required to be consumed.
-[`parse`](../basic_json/parse.md), [`accept`](../basic_json/accept.md), and all other inputs (strings, iterators,
-containers, `#!cpp FILE*`) are never affected.
-
-## Default definition
-
-The default value is `0` (disabled — existing behavior is preserved).
-
-```cpp
-#define JSON_PRECISE_STREAM_POSITION 0
-```
-
-## Notes
-
-!!! note "Background"
-
-    A number is the only JSON value whose end can be detected solely by reading the character that follows it. By
-    default, that character is consumed and not put back, so the stream is left one byte too far after a number, and
-    only after a number:
-
-    ```cpp
-    std::istringstream input("1true");
-    json j;
-    input >> j;  // j == 1, but the stream now starts at "rue"
-    ```
-
-    With this macro, the character is only looked at and left in the stream, so the stream starts at `true`. This
-    does not require the stream buffer to support putting a character back.
-
-    This was not changed unconditionally, because code can depend on the consumed character, even unknowingly (see
-    [#5340](https://github.com/nlohmann/json/issues/5340)). Both of the following work by default only because the
-    character after each number is swallowed, and behave differently with this macro:
-
-    ```cpp
-    std::istringstream input("1,2,3");
-    json j1, j2, j3;
-    input >> j1 >> j2 >> j3;  // default: 1, 2, 3
-                              // with the macro: throws parse_error.101 at the ','
-    ```
-
-    ```cpp
-    std::istringstream input("42\nfoo");
-    json j;
-    std::string line;
-    input >> j;
-    std::getline(input, line);  // default: "foo"
-                                // with the macro: "" (like after reading an int with >>)
-    ```
-
-    In both cases, the behavior with the macro is what you already get today when the value is not a number: `"a","b"`
-    fails at the `,`, and `std::getline` after `{}` returns an empty string. This macro offers an opt-in path to
-    the consistent behavior ahead of version 4.0.0, where it is planned to become the default.
-
-!!! warning "Opt-in only"
-
-    This macro must be defined **before** including `<nlohmann/json.hpp>`. Defining it after the include has no
-    effect.
-
-!!! note "ABI compatibility"
-
-    The value of this macro is encoded in the [namespace](../../features/namespace.md) (tag `_psp`), resulting in
-    distinct symbol names. Translation units compiled with and without it can therefore be linked into the same program
-    without One Definition Rule (ODR) violations, but they cannot exchange instances of library types.
-
-!!! tip "Workaround without the macro"
-
-    Separate the values in the stream with whitespace. The character consumed after a number is then the separator,
-    and whitespace before the next value is skipped anyway.
-
-## Examples
-
-??? example "Default behavior (macro not defined)"
-
-    Without the macro, the character after a number is consumed:
-
-    ```cpp
-    #include <iostream>
-    #include <sstream>
-    #include <nlohmann/json.hpp>
-
-    using json = nlohmann::json;
-
-    int main()
-    {
-        std::istringstream input("1true");
-        json j1, j2;
-        input >> j1;  // j1 == 1
-        input >> j2;  // throws parse_error.101: the stream now starts at "rue"
-    }
-    ```
-
-??? example "Opt-in precise stream position (macro defined to 1)"
-
-    With the macro, the stream is positioned right after the number:
-
-    ```cpp
-    #define JSON_PRECISE_STREAM_POSITION 1
-    #include <iostream>
-    #include <sstream>
-    #include <nlohmann/json.hpp>
-
-    using json = nlohmann::json;
-
-    int main()
-    {
-        std::istringstream input("1true");
-        json j1, j2;
-        input >> j1;  // j1 == 1
-        input >> j2;  // j2 == true
-    }
-    ```
-
-## See also
-
- [**operator>>**](../operator_gtgt.md) - deserialize from stream
- [**sax_parse**](../basic_json/sax_parse.md) - generate SAX events
-
-## Version history
-
- Added in version 3.13.0.
- Planned to become the default (with the macro removed) in version 4.0.0.
@@ -1,132 +0,0 @@
-# JSON_STRICT_NUL_HANDLING
-
-```cpp
-#define JSON_STRICT_NUL_HANDLING /* value */
-```
-
-When defined to `1`, a `'\0'` (NUL) byte in JSON text input is rejected with `parse_error.101`, like any other
-unexpected byte, instead of being silently treated as end of input.
-
-The macro only affects the JSON text parser ([`parse`](../basic_json/parse.md), [`accept`](../basic_json/accept.md),
-[`sax_parse`](../basic_json/sax_parse.md), and [`operator>>`](../operator_gtgt.md)). There are three cases where a NUL
-byte is still not rejected:
-
- The binary formats ([`from_bjdata`](../basic_json/from_bjdata.md), [`from_bon8`](../basic_json/from_bon8.md),
-  [`from_bson`](../basic_json/from_bson.md), [`from_cbor`](../basic_json/from_cbor.md),
-  [`from_msgpack`](../basic_json/from_msgpack.md), [`from_ubjson`](../basic_json/from_ubjson.md)) are never affected: there, `0x00` is ordinary data.
- A bare `const char*` pointer has no length of its own, so its length is still determined with `strlen()`. The first
-  NUL byte therefore still marks the end of the input, and nothing after it is read.
- One trailing `'\0'` at the end of a `char` array (e.g., a string literal) is trimmed; see the warning below.
-
-## Default definition
-
-The default value is `0` (disabled — existing behavior is preserved).
-
-```cpp
-#define JSON_STRICT_NUL_HANDLING 0
-```
-
-## Notes
-
-!!! note "Background"
-
-    By default, a `'\0'` byte anywhere in the input is treated the same as the real end of the input, rather than as
-    an ordinary (and, outside of a string, invalid) byte. Everything from that byte onward is silently ignored,
-    without a parse error - including further, otherwise well-formed JSON:
-
-    ```cpp
-    json::parse(std::string("123") + '\0');          // == 123, no error
-    json::parse(std::string("123") + '\0' + "true"); // == 123, the "true" is silently ignored too
-    ```
-
-    This falls out of the same convention used when no explicit input length is given at all: parsing from a
-    `const char*` already stops at the first NUL byte via `strlen()`, since a bare pointer has no length of its own.
-    The library applies that same NUL-terminated-C-string convention uniformly, rather than only when a length is
-    genuinely unavailable - so a `std::string`, iterator range, or container whose content happens to include a NUL
-    byte is affected the same way a raw `const char*` would be (see the
-    [FAQ entry](../../home/faq.md#nul-bytes-in-the-input) for a fuller explanation).
-
-    This was not fixed unconditionally, because doing so is backwards-incompatible for any caller who happens to
-    depend on the current behavior - even unknowingly, for instance because their input already contains trailing
-    padding they never noticed was being discarded (see [#5530](https://github.com/nlohmann/json/issues/5530)).
-    This macro instead offers an opt-in path to the corrected behavior ahead of version 4.0.0, where it is planned to
-    become the default.
-
-!!! warning "Opt-in only"
-
-    This macro must be defined **before** including `<nlohmann/json.hpp>`. Defining it after the include has no
-    effect.
-
-    Enabling it also changes how a `char` array (including a string literal, e.g. `json::parse("123")`) is read: such
-    an array normally carries a trailing `'\0'` contributed by the compiler, not by the source text. With this macro
-    enabled, that one trailing byte is trimmed if present so that parsing a string literal keeps working; every other
-    byte in the array - including any `'\0'` that is not the very last element - is read as real data and rejected
-    like any other unexpected byte. Arrays of any other element type (`unsigned char`, `std::uint8_t`, ...), as used
-    for CBOR or MessagePack, are never affected by this trimming; their full extent - including a genuine trailing
-    `0x00` - is always preserved, in both states of this macro.
-
-!!! note "ABI compatibility"
-
-    The value of this macro is encoded in the [namespace](../../features/namespace.md) (tag `_snul`), resulting in
-    distinct symbol names. Translation units compiled with and without it can therefore be linked into the same program
-    without One Definition Rule (ODR) violations, but they cannot exchange instances of library types.
-
-!!! tip "Workaround without the macro"
-
-    To reject a NUL byte without enabling this macro, trim your input yourself before calling `parse()`:
-
-    ```cpp
-    s.resize(s.find('\0')); // drop everything from the first NUL onward, if any
-    json::parse(s);
-    ```
-
-## Examples
-
-??? example "Default behavior (macro not defined)"
-
-    Without the macro, a NUL byte silently ends parsing at that point:
-
-    ```cpp
-    #include <nlohmann/json.hpp>
-
-    using json = nlohmann::json;
-
-    int main()
-    {
-        json j = json::parse(std::string("123") + '\0' + "true");
-        // j is 123 -- the '\0' and everything after it is silently ignored
-    }
-    ```
-
-??? example "Opt-in strict handling (macro defined to 1)"
-
-    With the macro, a NUL byte is rejected like any other unexpected byte:
-
-    ```cpp
-    #define JSON_STRICT_NUL_HANDLING 1
-    #include <nlohmann/json.hpp>
-
-    using json = nlohmann::json;
-
-    int main()
-    {
-        json j = json::parse(std::string("123") + '\0' + "true");
-        // throws parse_error.101 -- the NUL byte is now invalid input,
-        // exactly like any other unexpected trailing byte
-
-        json ok = json::parse("123");
-        // ok is 123 -- parsing from a string literal still works
-    }
-    ```
-
-## See also
-
- [FAQ: NUL bytes in the input](../../home/faq.md#nul-bytes-in-the-input)
- [**parse**](../basic_json/parse.md) - deserialize from a compatible input
- [**accept**](../basic_json/accept.md) - check if the input is valid JSON
- [**operator>>**](../operator_gtgt.md) - deserialize from stream
-
-## Version history
-
- Added in version 3.13.0.
- Planned to become the default (with the macro removed) in version 4.0.0.
@@ -12,11 +12,9 @@
 Controls how exceptions are handled by the library.

 1. This macro overrides [`#!cpp catch`](https://en.cppreference.com/w/cpp/language/try_catch) calls inside the library.
-   The argument is the type of the exception to catch. The library uses it in a single place: to swallow any exception
-   escaping the parent-pointer check that [`JSON_DIAGNOSTICS`](json_diagnostics.md) adds to the class invariant. The
-   places where the library catches its own [`json::out_of_range`](../../home/exceptions.md#out-of-range) exceptions
-   use `JSON_INTERNAL_CATCH` instead, which `JSON_CATCH_USER` also overrides unless `JSON_INTERNAL_CATCH_USER` is
-   defined. The macro is always followed by a scope.
+   The argument is the type of the exception to catch. As of version 3.8.0, the library only catches `std::out_of_range`
+   exceptions internally to rethrow them as [`json::out_of_range`](../../home/exceptions.md#out-of-range) exceptions.
+   The macro is always followed by a scope.
 2. This macro overrides `#!cpp throw` calls inside the library. The argument is the exception to be thrown. Note that
   `JSON_THROW_USER` should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield
   undefined behavior.
@@ -24,14 +24,6 @@ By default, implicit conversions are enabled.
    You can prepare existing code by already defining `JSON_USE_IMPLICIT_CONVERSIONS` to `0` and replace any implicit
    conversions with calls to [`get`](../basic_json/get.md).

-!!! tip "Automatic migration"
-
-    The community-maintained clang-tidy check `modernize-nlohmann-json-explicit-conversions` rewrites implicit
-    conversions into explicit calls to [`get`](../basic_json/get.md); for example, `#!cpp int i = j;` becomes
-    `#!cpp int i = j.get<int>();`. The check is not part of clang-tidy itself, and it does not catch every case (for
-    example, constructing a `std::optional` from a JSON value), so review the result. See
-    [discussion #4610](https://github.com/nlohmann/json/discussions/4610) for how to build and use it.
-
 !!! hint "CMake option"

    Implicit conversions can also be controlled with the CMake option
@@ -1,139 +0,0 @@
-# JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS
-
-```cpp
-#define JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS /* value */
-```
-
-When defined to `1`, maps whose keys are enums (such as `std::map<E, T>` or `std::unordered_map<E, T>`) are stored as
-JSON objects, using the enum's own conversion for the keys. By default, they are stored as arrays of `[key, value]`
-pairs.
-
-## Default definition
-
-The default value is `0` (disabled — existing behavior is preserved).
-
-```cpp
-#define JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS 0
-```
-
-## Notes
-
-!!! note "Background"
-
-    JSON object keys are strings, so a map is only stored as an object if its keys can be converted to a string type.
-    Enums are not, even if [`NLOHMANN_JSON_SERIALIZE_ENUM`](nlohmann_json_serialize_enum.md) maps them to strings, so a
-    map with enum keys becomes an array of `[key, value]` pairs:
-
-    ```json
-    [["stopped", "aa"], ["completed", "bb"]]
-    ```
-
-    With this macro, the same map becomes an object
-    (see [#4378](https://github.com/nlohmann/json/issues/4378)):
-
-    ```json
-    {"completed": "bb", "stopped": "aa"}
-    ```
-
-!!! note "Maps with non-unique keys"
-
-    Maps that allow duplicate keys, such as `std::multimap<E, T>` or `std::unordered_multimap<E, T>`, are not affected
-    by the macro and are still stored as arrays of `[key, value]` pairs, as an object cannot hold duplicate keys.
-
-!!! note "Reading"
-
-    Reading is not affected by the macro: a map with enum keys can always be read from both an array of pairs and an
-    object. For the latter, each key is converted to the enum with its `from_json` function, e.g., the one defined by
-    [`NLOHMANN_JSON_SERIALIZE_ENUM`](nlohmann_json_serialize_enum.md). Data written without the macro can therefore
-    still be read after enabling it.
-
-!!! warning "Keys must serialize to distinct strings"
-
-    Each key is converted with the enum's `to_json` function. If a key is not converted to a string (for instance, an
-    enum without [`NLOHMANN_JSON_SERIALIZE_ENUM`](nlohmann_json_serialize_enum.md), which is stored as an integer, or an
-    enumerator mapped to `nullptr`), [`type_error.302`](../../home/exceptions.md#jsonexceptiontype_error302) is thrown.
-    If two keys are converted to the same string (for instance, because
-    [`NLOHMANN_JSON_SERIALIZE_ENUM`](nlohmann_json_serialize_enum.md) maps an unlisted enumerator to the first entry),
-    [`type_error.318`](../../home/exceptions.md#jsonexceptiontype_error318) is thrown. In both cases, the target value
-    is not changed.
-
-!!! warning "Opt-in only"
-
-    This macro must be defined **before** including `<nlohmann/json.hpp>`. Defining it after the include has no effect.
-
-!!! note "ABI compatibility"
-
-    The value of this macro is encoded in the [namespace](../../features/namespace.md) (tag `_ekmo`), resulting in
-    distinct symbol names. Translation units compiled with and without it can therefore be linked into the same program
-    without One Definition Rule (ODR) violations, but they cannot exchange instances of library types.
-
-## Examples
-
-??? example "Default behavior (macro not defined)"
-
-    Without the macro, a map with enum keys is stored as an array of pairs:
-
-    ```cpp
-    #include <map>
-    #include <nlohmann/json.hpp>
-
-    using json = nlohmann::json;
-
-    enum TaskState { TS_STOPPED, TS_RUNNING, TS_COMPLETED };
-
-    NLOHMANN_JSON_SERIALIZE_ENUM(TaskState, {
-        {TS_STOPPED, "stopped"},
-        {TS_RUNNING, "running"},
-        {TS_COMPLETED, "completed"},
-    })
-
-    int main()
-    {
-        std::map<TaskState, std::string> m = {{TS_STOPPED, "aa"}, {TS_COMPLETED, "bb"}};
-
-        json j = m;
-        // j is [["stopped","aa"],["completed","bb"]]
-    }
-    ```
-
-??? example "Objects for enum-keyed maps (macro defined to 1)"
-
-    With the macro, the same map is stored as an object:
-
-    ```cpp
-    #define JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS 1
-    #include <map>
-    #include <nlohmann/json.hpp>
-
-    using json = nlohmann::json;
-
-    enum TaskState { TS_STOPPED, TS_RUNNING, TS_COMPLETED };
-
-    NLOHMANN_JSON_SERIALIZE_ENUM(TaskState, {
-        {TS_STOPPED, "stopped"},
-        {TS_RUNNING, "running"},
-        {TS_COMPLETED, "completed"},
-    })
-
-    int main()
-    {
-        std::map<TaskState, std::string> m = {{TS_STOPPED, "aa"}, {TS_COMPLETED, "bb"}};
-
-        json j = m;
-        // j is {"completed":"bb","stopped":"aa"}
-
-        auto m2 = j.get<std::map<TaskState, std::string>>();
-        // m2 == m
-    }
-    ```
-
-## See also
-
- [Specializing enum conversion](../../features/enum_conversion.md)
- [**NLOHMANN_JSON_SERIALIZE_ENUM**](nlohmann_json_serialize_enum.md) - serialize/deserialize an enum
- [**NLOHMANN_JSON_SERIALIZE_ENUM_STRICT**](nlohmann_json_serialize_enum_strict.md) - serialize/deserialize an enum with
-  exceptions
-
-## Version history
-
- Added in version 3.13.0.
@@ -1,71 +0,0 @@
-# JSON_USE_SIMDUTF
-
-```cpp
-#define JSON_USE_SIMDUTF
-```
-
-When defined, the parser validates the UTF-8 content of JSON strings that come from a **contiguous byte input**
-(`std::string`, `std::vector<char>`/`<std::uint8_t>`, string literals, `const char*` ranges, …) using the
-[simdutf](https://github.com/simdutf/simdutf) library instead of the built-in scalar validator. On text with many
-non-ASCII characters (e.g. CJK or emoji) this can validate several times faster.
-
-This is an **opt-in external dependency**. The library itself remains header-only and its behavior is unchanged: the
-same input is accepted or rejected either way, and every parse error is reported at the same position with the same
-message (simdutf is only used to fast-path *valid* runs; anything it flags falls back to the scalar path so the exact
-diagnostic is preserved). Streaming inputs (files, `std::istream`, wide strings, user-defined adapters) always use the
-scalar path.
-
-When `JSON_USE_SIMDUTF` is defined you must make the `simdutf.h` header available on the include path and link the
-simdutf library. When it is not defined, no simdutf header is included and there is no dependency.
-
-!!! note "Requires C++17"
-
-    simdutf requires C++17 and its header rejects older standards with an `#!cpp #error`. The backend is therefore only
-    compiled in from C++17 on. In C++11 and C++14 the macro has no effect and the scalar validator is used, which
-    accepts and rejects exactly the same input -- only throughput differs. Setting the macro project-wide is therefore
-    safe even when some translation units are built with an older standard.
-
-!!! warning "Define consistently"
-
-    The macro selects between two definitions of the same inline validation function. It must therefore be defined
-    identically for **every** translation unit that includes the library; mixing translation units that define it with
-    ones that do not is an ODR violation. Prefer setting it as a compile definition on the target rather than with
-    `#!cpp #define` in individual source files.
-
-## Default definition
-
-By default, `#!cpp JSON_USE_SIMDUTF` is not defined and the portable C++11 scalar validator is used.
-
-```cpp
-#undef JSON_USE_SIMDUTF
-```
-
-## Examples
-
-??? example
-
-    The code below enables the simdutf backend for UTF-8 validation.
-
-    ```cpp
-    #define JSON_USE_SIMDUTF 1
-    #include <nlohmann/json.hpp>
-
-    ...
-    ```
-
-    The project must also link against simdutf, e.g. with CMake:
-
-    ```cmake
-    target_compile_definitions(your_target PRIVATE JSON_USE_SIMDUTF)
-    target_link_libraries(your_target PRIVATE simdutf::simdutf)
-    ```
-
-!!! hint "Testing this configuration"
-
-    The unit tests can be built against the simdutf backend with the CMake option `JSON_TestSimdutf` (`OFF` by
-    default), which fetches simdutf and defines `JSON_USE_SIMDUTF` for every test target. The `ci_test_simdutf` target
-    runs the whole test suite in that configuration.
-
-## Version history
-
- Added in version 3.13.0.
@@ -57,8 +57,7 @@ Summary:
 :   name of the base type (class, struct) `type` is derived from

 `member` (in)
-:   name of the member variable to serialize/deserialize; up to 63 members can be given as a comma-separated
-    list, which may also be empty
+:   name of the member variable to serialize/deserialize; up to 63 members can be given as a comma-separated list

 ## Default definition

@@ -128,20 +127,6 @@ void to_json(BasicJsonType& j, const B& b) {
    - Macros 4, 5, and 6 have the same prerequisites of [NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE](nlohmann_define_type_non_intrusive.md).
    - Serialization/deserialization of base types must be defined.

-!!! info "Derived types without own members"
-
-    The member list may be empty. The macro then generates a `to_json`/`from_json` pair that only delegates to
-    the base type, so `type` serializes exactly like `base_type`:
-
-    ```cpp
-    struct derived : base
-    {
-        NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(derived, base)
-    };
-    ```
-
-    The `WITH_NAMES` variants do not support this.
-
 !!! warning "Implementation limits"

    See Implementation limits for [NLOHMANN_DEFINE_TYPE_INTRUSIVE](nlohmann_define_type_intrusive.md) and
@@ -33,8 +33,7 @@ Summary:
 :   name of the type (class, struct) to serialize/deserialize

 `member` (in)
-:   name of the member variable to serialize/deserialize; up to 63 members can be given as a comma-separated
-    list, which may also be empty
+:   name of the member variable to serialize/deserialize; up to 63 members can be given as a comma-separated list

 ## Default definition

@@ -59,27 +58,10 @@ See the examples below for the concrete generated code.

 [GetNonDefNonCopy]: ../../features/arbitrary_types.md#how-can-i-use-get-for-non-default-constructiblenon-copyable-types

-!!! info "Types without members"
-
-    The member list may be empty. The macro then generates a `to_json` that produces an empty JSON object
-    `#!json {}`, and a `from_json` that reads no members:
-
-    ```cpp
-    struct marker
-    {
-        NLOHMANN_DEFINE_TYPE_INTRUSIVE(marker)
-    };
-    ```
-
-    The `WITH_NAMES` variants do not support this.
-
 !!! warning "Implementation limits"

    - The current implementation is limited to at most 63 member variables. If you want to serialize/deserialize types
      with more than 63 member variables, you need to define the `to_json`/`from_json` functions manually.
-    - These macros always produce object-style (named-key) JSON, one key per member. There is no macro variant
-      that serializes a struct's members positionally into a JSON array; for that, write `to_json`/`from_json` by
-      hand, building/reading a `json::array()` of the members in order.

 ## Examples

@@ -33,8 +33,7 @@ Summary:
 :   name of the type (class, struct) to serialize/deserialize

 `member` (in)
-:   name of the (public) member variable to serialize/deserialize; up to 63 members can be given as a
-    comma-separated list, which may also be empty
+:   name of the (public) member variable to serialize/deserialize; up to 63 members can be given as a comma-separated list

 ## Default definition

@@ -60,25 +59,10 @@ See the examples below for the concrete generated code.

 [GetNonDefNonCopy]: ../../features/arbitrary_types.md#how-can-i-use-get-for-non-default-constructiblenon-copyable-types

-!!! info "Types without members"
-
-    The member list may be empty. The macro then generates a `to_json` that produces an empty JSON object
-    `#!json {}`, and a `from_json` that reads no members:
-
-    ```cpp
-    struct marker {};
-    NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(marker)
-    ```
-
-    The `WITH_NAMES` variants do not support this.
-
 !!! warning "Implementation limits"

    - The current implementation is limited to at most 63 member variables. If you want to serialize/deserialize types
      with more than 63 member variables, you need to define the `to_json`/`from_json` functions manually.
-    - These macros always produce object-style (named-key) JSON, one key per member. There is no macro variant
-      that serializes a struct's members positionally into a JSON array; for that, write `to_json`/`from_json` by
-      hand, building/reading a `json::array()` of the members in order.

 ## Examples

@@ -75,4 +75,4 @@ For further information please refer to the corresponding macros without `WITH_N

 ## Version history

-1. Added in version 3.13.0.
+1. Added in version 3.12.x.
--- a/Show More
+++ b/Show More