[issue16290] PyComplex_AsCComplex should allow __complex__ to return float.

[Mark Dickinson]

Mark Dickinson added the comment:

I've been convinced by the python-dev discussion that Antonio was right: it's complex_new that's in error rather than the cmath functions.  Even so, it would be unsafe to change the behaviour in the maintenance releases.

Attaching a new patch that disallows 'float'-type returns from the __complex__ method.

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Added file: http://bugs.python.org/file27764/issue16290v2.patch

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