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# v3.1.0
Released on 2018-02-01.
Feature release. All changes are backward-compatible.
- Adds [UBJSON](../../features/binary_formats/ubjson.md) read/write support and
[JSON Merge Patch](../../features/merge_patch.md) via [`merge_patch`](../../api/basic_json/merge_patch.md).
- Switches to the Grisu2 algorithm for short, round-trippable floating-point output, and splits the
header into [multiple files](../../integration/index.md) with a forward-declaration header.
[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.1.0).
## API changes
<!-- api-changes -->