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pythongh-120937: Reference weakref from the __del__ documentation
The weakref documentation refers to __del__, but not the other way around.
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‎Doc/reference/datamodel.rst‎

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@@ -1667,6 +1667,8 @@ Basic customization
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It is not guaranteed that :meth:`__del__` methods are called for objects
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that still exist when the interpreter exits.
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:class:`~weakref.finalize` provides a straight forward way to register
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a cleanup function to be called when an object is garbage collected.
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.. note::
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