[3.9] bpo-40217: Ensure Py_VISIT(Py_TYPE(self)) is always called for PyType_FromSpec types (reverts GH-19414) (GH-20264) #20490
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Heap types now always visit the type in tp_traverse. See added docs for details.
This reverts commit 0169d30.
Automerge-Triggered-By: @encukou
(cherry picked from commit 1cf15af)
Co-authored-by: Pablo Galindo [email protected]
https://bugs.python.org/issue40217
Automerge-Triggered-By: @encukou