[issue18797] Don't needlessly change refcounts of dummy objects for sets

[Antoine Pitrou]

Antoine Pitrou added the comment:

I can't think of any counter-indication but I think we shouldn't distinguish between debug and non-debug mode. That way the debug hooks can check that the refcounting optimization is right.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18797>
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