Python 3.12 segfault with mixin classes

[Florian Bruhin]

Hey,

> I am also seeing segfaults with the cpython main branch + pyqt6.  I had a
> suspicion it was that change, but had not had time to verify or make a
> minimal example (making a Matplotlib figure segfaulted).

For what it's worth, I see the exact same crash on the main branch too,
so it's entirely possible that you see the same issue.

> numpy and cython also had issues, see
> https://github.com/python/cpython/issues/104614 , however even with those
> PRs landed I'm still seeing segfaults with PyQt6.

I'll add a comment there as well.

Florian
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