[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:

Reopening because there appears to be a problem with the fix (see PR 21473).

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status: closed -> open

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<https://bugs.python.org/issue39960>
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