[issue39960] Using typename.__setattr__ in extension type with Py_TPFLAGS_HEAPTYPE is broken (hackcheck too eager?)

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

@Stefan Do you agree that the fix proposed in PR 21473 needs to be made?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39960>
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