val blit : (t, Base.bytes) Base.Blit.blitval blito : (t, Base.bytes) Base.Blit.blitoval unsafe_blit : (t, Base.bytes) Base.Blit.blitinclude Base.Blit.S_to_string with type t := t
val sub : t -> pos:int -> len:int -> stringval subo : ?pos:int -> ?len:int -> t -> string