code: function emitObject() {
      var body = bodec.join(parts);
      if (body.length !== length) {
        throw new Error("Body length mismatch");
      }
      var item = {
        type: numToType[type],
        size: length,
        body: body,
        offset: start
      };
      if (ref) item.ref = ref;
      parts.length = 0;
      start = 0;
      offset = 0;
      type = 0;
      length = 0;
      ref = null;
      emit(item);
    }
docs: Common helper for emitting all three object shapes