[issue6431] Fraction fails equality test with a user-defined type

[Mark Dickinson]

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

I agree this should be fixed.  The conversion to float in the else 
clause seems wrong to me: it can lose precision, making two unequal 
values compare equal.  I also agree that we should be getting 
NotImplemented here.

Do you have a patch available?

As an aside, I'm interested that you're implementing comparisons between 
mpf and Decimal;  how does that work?  Do you also implement binary 
arithmetic operations between mpf and Decimal?  What's the result type?

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nosy: +jyasskin, marketdickinson

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