[issue24165] Free list for single-digits ints

[INADA Naoki]

Changes by INADA Naoki <songofacandy at gmail.com>:


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nosy: +inada.naoki
versions: +Python 3.7 -Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24165>
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