[issue16195] Difficult or impossible to figure out how garbage collector and weak references should interact for user-defined extension types

[Stefan Behnel]

Stefan Behnel added the comment:

Just as a quick update here: Cython has since then switched to only using 
PyObject_ClearWeakRefs() and otherwise leaves the handling of the weakref slot 
to CPython.

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<http://bugs.python.org/issue16195>
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