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Tue Oct 13 20:08:07 EDT 2015 · https://mail.python.org/pipermail/python-dev/2015-October/141911.html

On Tue, Oct 13, 2015 at 04:37:43PM -0700, Raymond Hettinger wrote:

> We could have (and still could) make the choice to always coerce to 
> decimal (every float is exactly representable in decimal).  Further, 
> any decimal float or binary float could be losslessly coerced to a 
> Fraction, but that probably isn't what you really want most of the 
> time.  I think people who work in decimal usually want to stay there 
> and people who work with binary floating point want to stay there as 
> well (invisible coercions being more likely to cause pain than relieve 
> pain).

Further to what Raymond says, if anyone wants to persue this further, 
and wants to argue for such automatic promotion of float to Decimal (or 
vice versa), I think a good place to start would be a survey of other 
languages with a numeric tower. How do they handle similar situations?

-- 
Steve

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[Python-Dev] PEP 0484 - the Numeric Tower