map -package:base-compat -package:base -package:basement -package:blaze-html -package:invertible -package:imports -package:insert-ordered-containers -package:charset -package:base-prelude 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.