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@johnslavik johnslavik commented Jan 13, 2026

I've chosen to go ahead with a 5-year deprecation period as Alex told me he'd do at least (thx!).
If this deprecation is too problematic, we can raise the warning eternally / soft deprecate -- and never eventually raise an exception.


📚 Documentation preview 📚: https://cpython-previews--143806.org.readthedocs.build/

No members are added to protocol classes to simplify testing. `issubclass` can only check method members.
@johnslavik johnslavik marked this pull request as ready for review January 13, 2026 16:08
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