`sig type extern_flags = No_sharing | Closures | Compat_32 val to_channel : Pervasives.out_channel -> 'a -> Marshal.extern_flags list -> unit external to_bytes : 'a -> Marshal.extern_flags list -> bytes = "caml_output_value_to_string" external to_string : 'a -> Marshal.extern_flags list -> string = "caml_output_value_to_string" val to_buffer : bytes -> int -> int -> 'a -> Marshal.extern_flags list -> int val from_channel : Pervasives.in_channel -> 'a val from_bytes : bytes -> int -> 'a val from_string : string -> int -> 'a val header_size : int val data_size : bytes -> int -> int val total_size : bytes -> int -> int end`