Builder.PushMessageHeaderval has_time_sent : t -> boolval time_sent_get : t -> UnixNano.tval time_sent_set_reader : t -> UnixNano.struct_t reader_t -> UnixNano.tval time_sent_set_builder : t -> UnixNano.t -> UnixNano.tval time_sent_init : t -> UnixNano.tval init_root : ?message_size:int -> unit -> t