[issue28737] Document that tp_dealloc handler must call PyObject_GC_UnTrack if Py_TPFLAGS_HAVE_GC is set

[Sam Gross]

Sam Gross <colesbury at gmail.com> added the comment:

Antoine Pitrou already fixed the "noddy4" example (now renamed to "custom4") and updated the newtypes_tutorial, but I think it's still worth mentioning PyObject_GC_Untrack in a few additional places.

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<https://bugs.python.org/issue28737>
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