code: public List<Long> fetchIncoming() { // TODO: replace with primitive specialization
          if (incoming == null || incoming.isEmpty()) {
              //return EMPTY_LONG_LIST;
              return Collections.emptyList(); // TODO: replace with primitive specialization
          }
          //TLongList result = incoming;
          List<Long> result = incoming;
          this.incoming = null;
          return result;
      }
docs: public TLongList fetchIncoming() {