[issue5759] __float__ not called by 'float' on classes derived from str

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


Added file: http://bugs.python.org/file13691/issue5759-py3k-test.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5759>
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