Message 325061 - Python tracker

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I don't think PEP 384 should be updated. It documents the feature as it was added, and shouldn't be used as documentation now.
Instead, Python documentation should be improved to cover all of PEP 389.
I submitted a pull request for that (GH-9154).

For this issue, the fix should be updating C API documentation and, for Pyhon 3.8+, making {*, NULL} slots override the inherited value.

I think the PyType_Spec/PyType_Slot copying should have its own issue.