[issue8425] a -= b should be fast if a is a small set and b is a large set

[Cheryl Sabella]

Cheryl Sabella <cheryl.sabella at gmail.com> added the comment:

@maker, would you be interested in converting your patch to a Github pull request?  Thanks!

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nosy: +cheryl.sabella
versions: +Python 3.8 -Python 3.4

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