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Yes, I'd certainly be interested in reviewing a patch. Though the current behaviour is at most a minor wart, and since it's gone in Python 3.x the motivation to fix it isn't huge. :)
> Where as I think gumtree wants the xcomplex case to behave as
> the xfloat case, e.g. ...
Yes, that was what I was proposing. But as you point out, the new behaviour wouldn't even match the behaviour of Python 3.x, so it really wouldn't be a terribly useful change.
> However, if we are going to do that then we might as well just
> backport the whole removal of coercion.
That's not really an option: it has the potential to break existing code that uses coercion. Removing coercion in Python 2.x would require at least a PEP plus one version's worth of DeprecationWarning. And given that it currently looks as though Python 2.8 isn't likely to happen at all, that would likely be a wasted effort.