[issue18032] Optimization for set/frozenset.issubset()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Personally I don't sure that this optimization is worth to apply. Its cost is high and optimized case is not common. This is rather an experiment, how large can be maximal effect of the optimization.

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<http://bugs.python.org/issue18032>
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