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

[Raymond Hettinger]

Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:

Any new logic should make maximum use of existing tools:

def __isub__(self, other)
    if len(other) > len(self)*8:
        other = self & other
    . . .
    # rest of isub unchanged

----------
stage: patch review -> needs patch

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<http://bugs.python.org/issue8425>
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