[issue27145] long_add and long_sub might return a new int where &small_ints[x] could be returned

[SilentGhost]

Changes by SilentGhost <ghost.adh at runbox.com>:


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nosy: +haypo, rhettinger
stage:  -> patch review
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27145>
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