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

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +20435
pull_request: https://github.com/python/cpython/pull/21288

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