[issue43908] array.array and re types must be immutable: add Py_TPFLAGS_IMMUTABLETYPE flag

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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title: array.array should remain immutable: add Py_TPFLAGS_IMMUTABLETYPE flag -> array.array and re types must be immutable: add Py_TPFLAGS_IMMUTABLETYPE flag

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43908>
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