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Title: Make Mapping covariant in keys (too). by gvanrossum · Pull Request #273 · python/typing · GitHub

Open Graph Title: Make Mapping covariant in keys (too). by gvanrossum · Pull Request #273 · python/typing

X Title: Make Mapping covariant in keys (too). by gvanrossum · Pull Request #273 · python/typing

Description: See python/typeshed#510

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Opengraph URL: https://github.com/python/typing/pull/273

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