[issue1621] Do not assume signed integer overflow behavior

[Guido van Rossum]

Guido van Rossum added the comment:

Would you mind also adding patches for the places you think you can fix,
and providing us with a list of places you need help with?

O'm hoping that Greg or Christian can help reviewing these and
committing them.  Thanks much for your help BTW!

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keywords: +patch

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