[issue39028] ENH: Fix performance issue in keyword extraction

[Inada Naoki]

Change by Inada Naoki <songofacandy at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions:  -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39028>
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