[issue46705] Memory optimization for set.issubset

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

I've run a few more experiments and this looks like a net win more often than not.  Go ahead and submit a PR so we can evaluate it further.

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Added file: https://bugs.python.org/file50614/instrument_issubset.py

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