[issue1635741] Py_Finalize() doesn't clear all Python objects at exit

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

In PR 23131, I added a comment to _PyInterpreter_Clear() to remind me that trying to destroy a Python type after the last GC collection doesn't work as expected:

    // All Python types must be destroyed before the last GC collection. Python
    // types create a reference cycle to themselves in their in their
    // PyTypeObject.tp_mro member (the tuple contains the type).

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<https://bugs.python.org/issue1635741>
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