[issue27581] Fix overflow check in PySequence_Tuple

[Xiang Zhang]

Xiang Zhang added the comment:

I'd prefer the size_t method. The others seems to make the logic not clear. I've seen some codes using size_t to do overflow checking, such as https://hg.python.org/cpython/file/tip/Python/bltinmodule.c#l1954. There are more if you use a simple grep. So I think the logic is okay.

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<http://bugs.python.org/issue27581>
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