Re: [Haskell-cafe] instance Enum Double considered not entirely great?

Daniel Fischer writes:

...

A numeric range [a..a+n] might be expected to have a+n+1 elements, but that doesn't hold either for Float and Double. I think Enum for floating point values is broken

Yes, it is. Like Eq and Ord.

.. only more so. And the brokenness has infected Rational: try [1,3..20]::[Rational]