[issue7406] int arithmetic relies on C signed overflow behaviour

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Fixed int_sub, int_add, int_mul, and the fast paths for BINARY_ADD and 
BINARY_SUB in ceval.c, in r76629 (trunk) and r76630 (release26-maint).

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<http://bugs.python.org/issue7406>
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