[issue38858] new_interpreter() should reuse more Py_InitializeFromConfig() code

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> bpo-38858: Allocate small integers on the heap (GH-17301)

I associated this change to this issue because I had troubles when I tried to call _PyLong_Fini() in subinterpreters. I'm now trying to have different small integers per interpreter.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38858>
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