Avoid re-slotting unnecessarily #78
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This avoids recreating a slot for an attribute if the slot already exists on the class.
The proxy used for this is if the attribute exists as a
MemberDescriptorTypeor one of ourSlottedCachedPropertyvalues.__slots__isn't checked because there's no guarantee there are any values there.This makes the behaviour of cached properties match more closely to that when
slots=False.