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Title: Make Mapping covariant. by gvanrossum · Pull Request #512 · python/typeshed · GitHub

Open Graph Title: Make Mapping covariant. by gvanrossum · Pull Request #512 · python/typeshed

X Title: Make Mapping covariant. by gvanrossum · Pull Request #512 · python/typeshed

Description: Collection of library stubs for Python, with static types - Make Mapping covariant. by gvanrossum · Pull Request #512 · python/typeshed

Open Graph Description: Fixes #510. This requires a # type: ignore on __getitem__ and get because mypy complains about covariant parameters. FWIW typing.py needs to be changed too. (It was covariant in the value but inva...

X Description: Fixes #510. This requires a # type: ignore on __getitem__ and get because mypy complains about covariant parameters. FWIW typing.py needs to be changed too. (It was covariant in the value but inva...

Opengraph URL: https://github.com/python/typeshed/pull/512

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Backpeddle a bit -- Mapping key type should not be covariant.https://github.com/python/typeshed/pull/512/commits/199c983c42d00387e5731acead08d6bc2627cb6e
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