It is standard practice to hide implementation details, in particular, not publishing the type of an object, but just the interfaces that its type implements. We can do this with existential types but the notation feels clumsy. See my message http://www.haskell.org//pipermail/haskell-cafe/2005-June/010516.html -- -- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 -- ---- http://www.imn.htwk-leipzig.de/~waldmann/ -------
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