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Niels Lohmann 02d57db31e Do not compare an edited NaN equal to itself in json_view (#6085 )

Two views compared equal when the tokens of two floats were equal, and
the same node was equal to itself. An edit writes a NaN as the token
"nan", so a view of it (or of an array holding it) was equal to itself
and to another NaN, while json(NaN) == json(NaN) and view == json are
false. The token shortcut now excludes the edited "nan" token (found by
the missing digit layout), dispatched on the document mode by a tag: a
read-only document cannot hold a NaN, and its walk is unchanged
(instruction count and cycles on canada, citm and twitter within
noise). For editable documents the check costs about 2 % instructions
on canada (cycles within noise). The same-node shortcut is kept for
read-only documents and for editable ones that were never edited; a
document with edits is walked, so comparing it with itself is linear
instead of constant.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-11-11 22:36:54 +01:00

docset

Fix Semgrep findings in Python tooling (#5899 )

2026-10-23 07:11:17 +02:00

mkdocs

Do not compare an edited NaN equal to itself in json_view (#6085 )

2026-11-11 22:36:54 +01:00

avatars.png

🔖 set version to 3.12.0 (#4727 )

2025-04-11 10:41:14 +02:00

Makefile

Review and extend the documentation, and check it in CI (#5638 )

2026-10-02 11:32:15 +02:00

README.md

Clean up non-code files (#5801 )

2026-10-11 08:21:51 +02:00

README.md

Documentation

Generate documentation

Note on documentation: The source files contain links to the online documentation at https://json.nlohmann.me.
This URL provides the most recent documentation and also applies to previous versions. Documentation for deprecated functions is not removed; instead, it is marked as deprecated.

If you want to view the documentation for a specific tag or commit hash, you can generate it locally as follows (example using tag v3.12.0):

git clone https://github.com/nlohmann/json.git
cd json
git checkout v3.12.0
make install_venv serve -C docs/mkdocs

Open http://127.0.0.1:8000/ in your browser. Replace any URL in the source code that points to https://json.nlohmann.me with http://127.0.0.1:8000 to view the documentation for the selected tag or commit hash.