[issue21988] Decrease iterating overhead in timeit

[Steven D'Aprano]

Steven D'Aprano added the comment:

Looks good, but I think it is better to have an "unroll" option rather than do it automatically. I'm okay with the default being to unroll, but sometimes I want to compare the speed between different versions of Python, and having unroll=False to ensure the same behaviour between versions would be good.

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nosy: +steven.daprano

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<http://bugs.python.org/issue21988>
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