[issue23359] Speed-up set_lookkey()

[Raymond Hettinger]

Raymond Hettinger added the comment:

Thank Serhiy.  No early-out on insertion is possible.
For discard and contains, there is still no need for
testing dummies and tracking freeslots.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23359>
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