[issue23367] integer overflow in unicodedata.normalize

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Because isize is the size of real PyUnicode object. It's maximal value is PY_SSIZE_T_MAX - sizeof(PyASCIIObject) - 1.

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<http://bugs.python.org/issue23367>
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