[issue19515] Share duplicated _Py_IDENTIFIER identifiers in C code

[STINNER Victor]

STINNER Victor added the comment:

> Victor: There already *is* a cleanup function that clears all allocated identifier memory at interpreter shutdown. Please read the source.

Oh, great! I never noticed _PyUnicode_ClearStaticStrings().

Call trace: Py_Finalize() -> _PyUnicode_ClearStaticStrings() ->
_PyUnicode_Fini().

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<http://bugs.python.org/issue19515>
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