sig
type elt = char
type t = Bytes.t
val empty : t
val make : int -> elt -> t
val length : t -> int
val get : t -> int -> elt
val set : t -> int -> elt -> unit
val sub : t -> int -> int -> t
val copy : t -> t
val blit : t -> int -> t -> int -> int -> unit
val iter : (elt -> unit) -> t -> unit
end