Python 3.13 refcounting related memory corruption

[Florian Bruhin]

> Unfortunately I've not been able to extract a minimal example by any
> means. The best I could get is getting it down to running 11 test files
> in qutebrowser, with almost 2000 test cases. If I remove any of those
> files, the bug doesn't trigger anymore.

I've been able to reduce this to a minimal example now, which is
attached and (at least for me) crashes reliably with Python 3.13.

Florian
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