docs: Object addRightMostKey(
      Object            new1)
    {
      Object old1 = null;
  
      if (isFull())                  /* Node is currently full                */
        {                            /* We will overlay right-most key        */
          old1 = rightMostKey();
          _nodeKey[rightMostIndex()] = new1;
        }
      else
        {
          _population++;
          _nodeKey[rightMostIndex()] = new1;
          if (midPoint() > rightMostIndex())
            _nodeKey[midPoint()] = rightMostKey();
        }
  
      return old1;
    }