[3.10] bpo-44490: Add __parameters__ and __getitem__ to types.Union (GH-26980) - #27207

[3.10] bpo-44490: Add __parameters__ and __getitem__ to types.Union (GH-26980)#27207

serhiy-storchaka merged 3 commits into

python:3.10python/cpython:3.10from

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