Re: [Haskell-cafe] Why is toRational a method of Real?

On Thu, Aug 5, 2010 at 1:55 PM, Henning Thielemann wrote:

It's even worse: The NumericPrelude is in progress, certainly currently better than Haskell 98's type classes, but there are known problems. Sometimes new numeric types are implemented and require to refine or restructure the classes, again. And there are not only problems with the numeric type classes, think of Functor, Applicative, Monad, and so on. In my opinion before trying to move to an improved numerical type hierarchy we should have class aliases designed, implemented and thoroughly tested in GHC.

It's sad because the class alias proposal was dropped from Haskell' two years ago, isn't it ?