Number conversions, like floats to doubles

[Ben Escoto]

Quick and probably stupid question:

If I want to convert a Float to a Double, should I use

fromRational . toRational

?  It seems to work, but isn't this a bit weird?  It took a while for
me to figure this out.  I suppose they are rationals because of the
finite precision of Floats and Doubles?  And similarly, (fromInteger
. toInteger) is the right way to convert the integral types?

Why not just have a function like:

convertIntegral :: (Integral a, Integral b) => a -> b


-- 
Ben Escoto
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