val compose : ('b -> 'c) -> ('a -> 'b) -> 'a -> 'cval (@*) : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'bval default : 'a -> 'a option -> 'aval string_split : char -> string -> string listval string_split_chars : string -> string -> string listval is_prefix : string -> string -> boolval ends_with_escape : string -> boolval count_leading_spaces : string -> intval shorten_string : int -> string -> string