[issue24912] The type of cached objects is mutable

[STINNER Victor]

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

Update: a new Py_TPFLAGS_IMMUTABLETYPE flag was added in bpo-43908, and it's now checked rather than relying on Py_TPFLAGS_HEAPTYPE to decide if a type is "mutable" or not.

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nosy: +ned.deily

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