[issue2531] float compared to decimal is silently incorrect.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> My complaint is that it is silently wrong.

I appreciate that, but I don't see any good solution.  Yes, it would be 
nice if float <-> Decimal comparisons raised TypeError in 2.x.  But Python 
2.x has an '(almost) everything is comparable to everything else' 
comparison model, so that for example a list of arbitrary Python objects 
can almost always be sorted.  So raising a TypeError for these comparisons 
has the potential to break already existing code.  Of course, it *might* 
not cause any breakage at all, but it's difficult to see how one could 
ever be sure of that.

I think the best we can do would be to add a warning for float <-> Decimal 
comparisons.  Facundo, Raymond: does this seem reasonable?

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<http://bugs.python.org/issue2531>
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