Jeroen Demeyer <j.deme...@ugent.be> added the comment:

> If we want to support other numerical types with loss in double rounding, the 
> most reliable way is to represent them as fractions (x.as_integer_ratio() or 
> (x.numerator, x.denominator))

See 
https://discuss.python.org/t/pep-3141-ratio-instead-of-numerator-denominator/2037/24?u=jdemeyer
 for a proposal to define __ratio__ for this.

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