code: @Override
      public Double getValue() {
          Double rslt = getUiValue();
          if (rslt == null) return internVal;
  
          if (internVal == null) {
              Double min = getMin();
              if (rslt == min || rslt != null && rslt.equals(min)) return null;
          }
          internVal = rslt;
          return rslt;
      }
docs: returns the current value of the slider