In the haddock generated doumentation the tag "stability" is "experimental" for most modules and "provisional" for the Haskell 98 Prelude modules (except e.g. Bool which is experimental, probably because it is in a different module from what the Haskell Report sais it would be). Having such overly conservative classification renders the whole tag useless. All Prelude modules should be "stable" as well as the FFI, FiniteMap and many others. Cheers, Axel.