Builder.PushMessageHeader
val has_time_sent : t -> bool
val time_sent_get : t -> UnixNano.t
val time_sent_set_reader : t -> UnixNano.struct_t reader_t -> UnixNano.t
val time_sent_set_builder : t -> UnixNano.t -> UnixNano.t
val time_sent_init : t -> UnixNano.t
val init_root : ?message_size:int -> unit -> t