map -package:vector -is:exact -package:bytestring -package:blaze-html -package:containers -package:hedgehog -package:invertible -package:filepath package:case-insensitive -is:exact

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