[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

First stub at fixing overflows, regresses following tests :

test_doctests.py
test_locale.py
test_long.py
test_long_future.py
test_optparse.py
test_pickle.py
test_str.py (crash)
test_string.py (crash)
test_unicode.py (crash)
test_userstring.py (crash)
test_xpickle.py

Not great, but a start.

Added file: http://bugs.python.org/file9211/fix-overflows-try1.patch

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