[issue45167] deepcopy of GenericAlias with __deepcopy__ method is broken

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

Serhiy, can you elaborate how GH-28306 can break protocols using other special methods? I can't come up with an example.

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nosy: +lukasz.langa

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<https://bugs.python.org/issue45167>
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