map -package:containers -package:dlist -package:conduit -package:basement -package:bytestring -package:charset -package:filepath -package:foldl -package:regex-tdfa package:case-insensitive

map :: FoldCase s2 => (s1 -> s2) -> CI s1 -> CI s2
case-insensitive Data.CaseInsensitive
Transform the original string-like value but keep it case insensitive.