[issue35983] tp_dealloc trashcan shouldn't be called for subclasses

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> Jeroen, could you share your example? I am learning the C-API of Python and this example could be interesting.

Either use the Cython code I posted above or run the testcase I added in PR 11841.

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<https://bugs.python.org/issue35983>
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