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hauntsaninja merged 1 commit into from
Dec 14, 2025
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Update changelog for 1.19.1 #20414

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26 changes: 17 additions & 9 deletions CHANGELOG.md
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Expand Up @@ -11,17 +11,14 @@ Support for this will be dropped in the first half of 2026!

Contributed by Marc Mueller (PR [20156](https://github.com/python/mypy/pull/20156)).

### Removed Flag: `--force-uppercase-builtins`
### Removed flags `--force-uppercase-builtins` and `--force-union-syntax`

Removed the deprecated `--force-uppercase-builtins` flag. It has been a no-op since mypy 1.17.0.
The `--force-uppercase-builtins` flag was deprecated and has been a no-op since mypy 1.17.0.
Since mypy has dropped support for Python 3.9, the `--force-union-syntax` flag is no longer
necessary.

Contributed by Marc Mueller (PR [20410](https://github.com/python/mypy/pull/20410))

### Removed Flag: `--force-union-syntax`

Mypy only supports Python 3.10+. Removed the `--force-union-syntax` flag as it's no longer necessary.

Contributed by Marc Mueller (PR [20405](https://github.com/python/mypy/pull/20405))
and (PR [20405](https://github.com/python/mypy/pull/20405)).

## Mypy 1.19

Expand Down Expand Up @@ -228,6 +225,17 @@ Related PRs:

Please see [git log](https://github.com/python/typeshed/commits/main?after=ebce8d766b41fbf4d83cf47c1297563a9508ff60+0&branch=main&path=stdlib) for full list of standard library typeshed stub changes.

### Mypy 1.19.1

- Fix noncommutative joins with bounded TypeVars (Shantanu, PR [20345](https://github.com/python/mypy/pull/20345))
- Respect output format for cached runs by serializing raw errors in cache metas (Ivan Levkivskyi, PR [20372](https://github.com/python/mypy/pull/20372))
- Allow `types.NoneType` in match cases (A5rocks, PR [20383](https://github.com/python/mypy/pull/20383))
- Fix mypyc generator regression with empty tuple (BobTheBuidler, PR [20371](https://github.com/python/mypy/pull/20371))
- Fix crash involving Unpack-ed TypeVarTuple (Shantanu, PR [20323](https://github.com/python/mypy/pull/20323))
- Fix crash on star import of redefinition (Ivan Levkivskyi, PR [20333](https://github.com/python/mypy/pull/20333))
- Fix crash on typevar with forward ref used in other module (Ivan Levkivskyi, PR [20334](https://github.com/python/mypy/pull/20334))
- Fail with an explicit error on PyPy (Ivan Levkivskyi, PR [20389](https://github.com/python/mypy/pull/20389))

### Acknowledgements

Thanks to all mypy contributors who contributed to this release:
Expand Down Expand Up @@ -263,7 +271,7 @@ Thanks to all mypy contributors who contributed to this release:

I’d also like to thank my employer, Dropbox, for supporting mypy development.

## Mypy 1.18.1
## Mypy 1.18

We’ve just uploaded mypy 1.18.1 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)).
Mypy is a static type checker for Python. This release includes new features, performance
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