Dear all, I had this old module laying around that I wrote some time ago. I dusted it off and uploaded it to Hackage: http://hackage.haskell.org/package/case-insensitive-0.1 The package provides the module Data.CaseInsensitive which exports the CI type constructor which can be parameterised by a string-like type like: String, ByteString, Text, etc.. Comparisons of values of the resulting type are then insensitive to cases. It is my hope that one day packages like snap-core[1], http-types[2] or wai[3] all use this common way of making strings case insensitive. Regards, Bas [1] http://hackage.haskell.org/packages/archive/snap-core/latest/doc/html/Data-C... [2] http://hackage.haskell.org/packages/archive/http-types/0.3.0/doc/html/Networ... [3] http://hackage.haskell.org/packages/archive/wai/latest/doc/html/Network-Wai....