(backport from rev. 51368)
More information about Python's garbage collection
scheme can be found in section \ref{supporting-cycle-detection}.
- This field is inherited by subtypes together with \member{tp_clear}
+ This field is inherited by subtypes together with \member{tp_traverse}
and the \constant{Py_TPFLAGS_HAVE_GC} flag bit: the flag bit,
\member{tp_traverse}, and \member{tp_clear} are all inherited from
the base type if they are all zero in the subtype \emph{and} the