[issue1621] Do not assume signed integer overflow behavior

["Martin v. Löwis" <report@bugs.python.org> at psf.upfronthosting.co.za]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> I don't see why.  There's nothing in -Wall -Wextra -Wsigned-overflow
> that asks for warnings for code that might overflow.

Ah, right. I misunderstood (rather, didn't bother checking) what
-Wsigned-overflow really does.

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<http://bugs.python.org/issue1621>
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