[issue41295] CPython 3.8.4 regression on __setattr__ in multiinheritance with metaclasses

[kam193]

kam193 <kam193 at wp.pl> added the comment:

@Stefan: Today I run unit tests for Flask-SQLAlchemy (v2.4.3) as well as for aioxmpp (another library reported this problem https://github.com/horazont/aioxmpp/issues/342). In both cases patch is successful: tests fail on Python 3.8.4 but pass on patched Python.

As for me it looks done. Thanks for everyone involved!

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<https://bugs.python.org/issue41295>
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