`sig external length : bytes -> int = "%string_length" external get : bytes -> int -> char = "%string_safe_get" external set : bytes -> int -> char -> unit = "%string_safe_set" external create : int -> bytes = "caml_create_string" val make : int -> char -> bytes val init : int -> (int -> char) -> bytes val empty : bytes val copy : bytes -> bytes val of_string : string -> bytes val to_string : bytes -> string val sub : bytes -> int -> int -> bytes val sub_string : bytes -> int -> int -> string val extend : bytes -> int -> int -> bytes val fill : bytes -> int -> int -> char -> unit val blit : bytes -> int -> bytes -> int -> int -> unit val blit_string : string -> int -> bytes -> int -> int -> unit val concat : bytes -> bytes list -> bytes val cat : bytes -> bytes -> bytes val iter : (char -> unit) -> bytes -> unit val iteri : (int -> char -> unit) -> bytes -> unit val map : (char -> char) -> bytes -> bytes val mapi : (int -> char -> char) -> bytes -> bytes val trim : bytes -> bytes val escaped : bytes -> bytes val index : bytes -> char -> int val rindex : bytes -> char -> int val index_from : bytes -> int -> char -> int val rindex_from : bytes -> int -> char -> int val contains : bytes -> char -> bool val contains_from : bytes -> int -> char -> bool val rcontains_from : bytes -> int -> char -> bool val uppercase : bytes -> bytes val lowercase : bytes -> bytes val capitalize : bytes -> bytes val uncapitalize : bytes -> bytes val uppercase_ascii : bytes -> bytes val lowercase_ascii : bytes -> bytes val capitalize_ascii : bytes -> bytes val uncapitalize_ascii : bytes -> bytes type t = bytes val compare : Bytes.t -> Bytes.t -> int val equal : Bytes.t -> Bytes.t -> bool val unsafe_to_string : bytes -> string val unsafe_of_string : string -> bytes external unsafe_get : bytes -> int -> char = "%string_unsafe_get" external unsafe_set : bytes -> int -> char -> unit = "%string_unsafe_set" external unsafe_blit : bytes -> int -> bytes -> int -> int -> unit = "caml_blit_string" [@@noalloc] external unsafe_fill : bytes -> int -> int -> char -> unit = "caml_fill_string" [@@noalloc] end`