[issue42972] [C API] Heap types (PyType_FromSpec) must fully implement the GC protocol

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

> * functools._lru_list_elem
Looks like this type have performance in issue PR-5008 when supporting GC. I am not sure there have other similar questions or not.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42972>
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