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

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Raymond, have you forgotten to attach the patch or have you just set the stage to 'patch review' by mistake?

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nosy: +ezio.melotti
priority:  -> normal
stage: patch review -> unit test needed

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