[issue16290] PyComplex_AsCComplex should allow __complex__ to return float.

[Mark Dickinson]

Mark Dickinson added the comment:

> This means that you should add a branch for integers too.

I'd rather not go that far, at least in this issue:  we'd also end up changing __float__ to allow it to return an int, in that case.  If we're considering that, the discussion should go back to python-dev / python-ideas.

One difference is that int -> float is a lossy conversion that has to care about details like rounding and overflow.  float -> complex in contrast is much simpler.

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