[issue19187] Use a set for interned strings

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I afraid that adding new parameter to the set_contains_key function will slow down other set operations. It will be better return a key as the result of the function (NULL if not found).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19187>
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