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

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

Should we proceed with fixing GC for all heap types before continuing work with bpo-40077?

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<https://bugs.python.org/issue42972>
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