[issue23726] Don't enable GC for classes that don't add new fields

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

>>> class UserIntSlots(int):
...     __slots__ = ()
...     def __repr__(s): return '5'
... 
>>> (4).__class__ = UserIntSlots
>>> 2+2
5
>>> type(2+2)
<class '__main__.UserIntSlots'>

It looks weird.

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<http://bugs.python.org/issue23726>
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