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Title: Fix unsound variance by hauntsaninja · Pull Request #13714 · python/mypy · GitHub

Open Graph Title: Fix unsound variance by hauntsaninja · Pull Request #13714 · python/mypy

X Title: Fix unsound variance by hauntsaninja · Pull Request #13714 · python/mypy

Description: Optional static typing for Python. Contribute to python/mypy development by creating an account on GitHub.

Open Graph Description: Fixes #13713, fixes #736, fixes #8611

X Description: Fixes #13713, fixes #736, fixes #8611

Opengraph URL: https://github.com/python/mypy/pull/13714

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Invariance not enforced for class-scoped TypeVar used in base class expression https://github.com/python/mypy/issues/13713
Behavior of mypy not matching example in PEP 483 https://github.com/python/mypy/issues/8611
Check class type parameter variance violations in inheritance https://github.com/python/mypy/issues/736
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