Message 392286 - Python tracker

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> BTW, slightly related, AFAICT:
> - https://github.com/python/cpython/blob/e047239eafefe8b19725efffe7756443495cf78b/Objects/typeobject.c#L4620-L4668
> - bpo-24912

object_set_class() must be changed to check for Py_TPFLAGS_IMMUTABLETYPE flag, rather than Py_TPFLAGS_HEAPTYPE.

Erlend: Do you want to write such change?