[issue14376] sys.exit documents argument as "integer" but actually requires "subtype of int"

[Ethan Furman]

Ethan Furman added the comment:

I previously wrote:
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> Gareth, please ignore my comments about adding guards on the return value -- it is up
> to the O/S to use or adjust whatever Python returns.

Let me clarify that a bit: we need to protect against overflow from <long> to <int>; protecting against overflow from <int> to <O/S returncode size> is a separate issue.

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<http://bugs.python.org/issue14376>
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