val xxd : ?cols:int -> ?groupsize:int -> ?long:int -> ?buffer_size:(int * int) -> ?uppercase:bool -> colorscheme -> cfg
val caml : ?with_comments:bool -> ?cols:int -> ?long:int -> ?buffer_size:(int * int) -> ?uppercase:bool -> [ `List | `Array ] -> cfg
val o : cfg -> 's S.scheduler -> ('fi, bytes, 's, 'e) S.iflow -> ('fo, string, 's, 'e) S.oflow -> 'fi -> 'fo -> ('fi, 's, 'e) S.seek -> [ `Absolute of int | `Relative of int ] -> Stdlib.Format.formatter -> ((unit, 'e) Stdlib.result, 's) S.io