[issue1621] Do not assume signed integer overflow behavior

[Martin v. Löwis]

Martin v. Löwis added the comment:

> Btw I think we need an unsigned version of Py_ssize_t to fix this
> problem cleanly. I am not sure if you would agree with me though.

There is an unsigned version, it's called "size_t".

__________________________________
Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1621>
__________________________________