[issue1621] Do not assume signed integer overflow behavior

[Roundup Robot]

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

New changeset 698fa089ce70 by Mark Dickinson in branch 'default':
Issue #1621: Fix undefined behaviour in bytes.__hash__, str.__hash__, tuple.__hash__, frozenset.__hash__ and set indexing operations.
http://hg.python.org/cpython/rev/698fa089ce70

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nosy: +python-dev

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