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# v3.4.0
Released on 2018-10-30.
Feature release. All changes are backward-compatible.
- Adds [BSON](../../features/binary_formats/bson.md) read/write support.
- Adds configurable Unicode error handlers to [`dump`](../../api/basic_json/dump.md) (throw, replace with
U+FFFD, or ignore) and the
[`NLOHMANN_JSON_SERIALIZE_ENUM`](../../api/macros/nlohmann_json_serialize_enum.md) macro for
[enum conversion](../../features/enum_conversion.md).
- Improves parse-error messages with line/column positions and context.
[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.4.0).
## API changes
<!-- api-changes -->