[Haskell-beginners] rational exponents

[Christopher Howard]

Hi. I'm working with simple functions involving rational exponents. I 
noticed that the (**) function seems to do okay with negative powers, 
but that something else is needed for rational exponents:

Prelude> 2 ** (-2)
0.25
Prelude> 8 ** (1/3)
2.0
Prelude> 8 ** (2/3)
3.9999999999999996

Would there be a module meant for that sort of thing? I spent some time 
in Hoogle and Hackage looking around, but nothing obvious stood out.

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