* PR [#2547](https://github.com/tiangolo/fastapi/pull/2547) (read above) also fixes some false-positive mypy errors with `callbacks` parameters and when using the `OAuth2` class.
* 🐛 PR [#2547](https://github.com/tiangolo/fastapi/pull/2547) (read above) also fixes some false-positive mypy errors with `callbacks` parameters and when using the `OAuth2` class.