Misc.LongString

`sig
type t = bytes array
val create : int -> Misc.LongString.t
val length : Misc.LongString.t -> int
val get : Misc.LongString.t -> int -> char
val set : Misc.LongString.t -> int -> char -> unit
val blit :
Misc.LongString.t -> int -> Misc.LongString.t -> int -> int -> unit
val output :
Pervasives.out_channel -> Misc.LongString.t -> int -> int -> unit
val unsafe_blit_to_bytes :
Misc.LongString.t -> int -> bytes -> int -> int -> unit
val input_bytes : Pervasives.in_channel -> int -> Misc.LongString.t
end`