[issue42332] add __weakref__ to types.GenericAlias

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 71ba5f52d2a80e7beffc923c54c0b6345cd0637a by kj in branch '3.9':
[3.9] bpo-42332: Add weakref slot to types.GenericAlias (GH-23250) (GH-23309)
https://github.com/python/cpython/commit/71ba5f52d2a80e7beffc923c54c0b6345cd0637a


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<https://bugs.python.org/issue42332>
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