[issue1621] Do not assume signed integer overflow behavior

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 3fb9464f9b02 by Mark Dickinson in branch 'default':
Issue #1621: Fix undefined behaviour from signed overflow in datetime module hashes, array and list iterations, and get_integer (stringlib/string_format.h)
http://hg.python.org/cpython/rev/3fb9464f9b02

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