A library for efficient contigious integer slices of indexed data structures.
A specialized version of this library is contained in batteries under the name BatSubstring.
let range = Ranger.of_string "one two three four"
let twothreefour = range |> Ranger.drop_while ~f:((<>) ' ') |> Ranger.tl_exn
let () = assert (twothreefour = "two three four")