docs: protected R setItemType(String type) {
          JsonObject object = new JsonObject();
          if (mBodyMap.containsKey(BoxComment.FIELD_ITEM)) {
              BoxEntity item = (BoxEntity) mBodyMap.get(BoxComment.FIELD_ITEM);
              object = item.toJsonObject();
          }
          object.add(BoxEntity.FIELD_TYPE, type);
          BoxEntity item = new BoxEntity(object);
          mBodyMap.put(BoxComment.FIELD_ITEM, item);
          return (R) this;
      }