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

[Raymond Hettinger]

Raymond Hettinger added the comment:

There's no rush on this.  I have other work I want to do on set objects before applying further optimizations, so I want to hold off on it for a bit.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8425>
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