[issue9930] Incorrect semantics of __radd__ method for builtin types

[Mark Dickinson]

Changes by Mark Dickinson <dickinsm at gmail.com>:


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versions: +Python 3.2 -Python 2.5, Python 2.6, Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9930>
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