STINNER Victor added the comment:

You should not rely on undefined behaviour: check if the index is greater
or equal than PY_SSIZET_MAX - 1. __setstate__ must implement the same check.

You must always raise an error, not hide it in a second call to next (raise
StopIteration). Your unit test must check this behaviour.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22939>
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