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

[STINNER Victor]

STINNER Victor added the comment:

Serhiy Storchaka added the comment:
> Let's try. As I understand, issue10044 was rejected because it complicates the code too much. May be new attempt will be more successful.

I read that Mark rejected the issue #10044 because it introduces an
undefined behaviour.

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