[Haskell-cafe] interval arithmetic for integers?

[Nicolas Frisby]

I'm looking to not reinvent the wheel.

Is there an existing package that supports interval arithmetic on
integers (or more)? A possible complication is that I'm hoping to
include open intervals such as (GreaterEqThan 3).

If there's not a package to go with, any pointers on the appopriate
rules for this stuff? I started coding up multiplication and decided
it was harder than I first thought...

Thanks for your time,
Nick