+external equal : t -> string -> string -> bool = "ocaml_guestfs_equal"
+external strings : t -> string -> string array = "ocaml_guestfs_strings"
+external strings_e : t -> string -> string -> string array = "ocaml_guestfs_strings_e"
+external hexdump : t -> string -> string = "ocaml_guestfs_hexdump"