[issue43973] Use Py_TPFLAGS_IMMUTABLETYPE in __class__ assignments check

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

> Do you think that something should be changed? If yes, please open a new separated issue.

No, my comment was just for information :)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43973>
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