# v3.9.0

Released on 2020-07-27.

Feature release adding four long-requested features. All changes are backward-compatible.

- Optional [comment](../../features/comments.md) parsing in [`parse`](../../api/basic_json/parse.md) via the
  `ignore_comments` parameter.
- [`ordered_json`](../../api/ordered_json.md) to preserve the [insertion order](../../features/object_order.md)
  of object keys.
- An option to switch off [implicit conversions](../../api/macros/json_use_implicit_conversions.md).
- The [`NLOHMANN_DEFINE_TYPE_*`](../../features/arbitrary_types.md#simplify-your-life-with-macros)
  convenience macros, plus high-precision-number support for
  [UBJSON](../../features/binary_formats/ubjson.md) and CBOR tag handling.

[Full release notes](https://github.com/nlohmann/json/releases/tag/v3.9.0).

## API changes

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