[issue21955] ceval.c: implement fast path for integers with a single digit

[Raymond Hettinger]

Raymond Hettinger added the comment:

There also used to be a fast path for binary subscriptions with integer indexes.  I would like to see that performance regression fixed if it can be done cleanly.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21955>
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