[issue44392] Py_GenericAlias is not documented

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

> Can we remove this from the stable API during beta?

It was added (to PC/python3.def) in 3.9, so removing in 3.10 beta wouldn't be good.
It can be deprecated; should it?

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<https://bugs.python.org/issue44392>
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