Builder.StreamMessage
val has_stream_id : t -> bool
val stream_id_get : t -> StreamId.t
val stream_id_set_reader : t -> StreamId.struct_t reader_t -> StreamId.t
val stream_id_set_builder : t -> StreamId.t -> StreamId.t
val stream_id_init : t -> StreamId.t
val has_data : t -> bool
val data_get : t -> string
val data_set : t -> string -> unit
val init_root : ?message_size:int -> unit -> t