Serhiy Storchaka added the comment:

noincref.diff doesn't contain all necessary changes. For example dummy is 
increfed in dict_pop() and dict_popitem() and may be decrefed at insert.

As in sets we can got rid of few comparisons with dummy if set dummy hashes to 
-1.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18898>
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