[Haskell-cafe] String to Double conversion in Haskell

I am trying to convert a string to a float. It seems that Data.ByteString library only supports readInt. After some googling I came accross a possibloe implementation: http://sequence.svcs.cs.pdx.edu/node/373 My questions are: a) is there a standard library implementation of string -> Double and float? b) Why is it that the ByteString only supports readInt? Is there a reason for it? Thanks, Daryoush Mehrtash