code: public void inclRange(int start, int limit) {
          Assert.check(currentState != BitsState.UNKNOWN);
          sizeTo((limit >>> wordshift) + 1);
          for (int x = start; x < limit; x++) {
              bits[x >>> wordshift] = bits[x >>> wordshift] |
                  (1 << (x & wordmask));
          }
          currentState = BitsState.NORMAL;
      }
docs: Include [start..limit) in this set.