Richard Oudkerk added the comment:
The patch does not seem to walk the mro to look for slots in base classes.
Also, an instance with a __dict__ attribute may also have attributes stored in
slots.
BTW, copyreg._slotnames(cls) properly calculates the slot names for cls and
tries to cache them as cls.__slotnames__. Pickle does the equivalent of
try:
slotnames = cls.__slotnames__
except AttributeError:
slotnames = copyreg._slotnames(cls)
----------
nosy: +sbt
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<http://bugs.python.org/issue13290>
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