code: ASCIIBits set(int min, int max) {
          // There are faster bit-twiddling tricks to accomplish the same
          // thing as below.  Minor optimization for later.
          int i=min;
          for (int n = Math.min(max,63) ; i<=n ; ++i) {
              _lowerMask |= (1L << i);
          }
          for ( ; i<=max ; ++i) {
              _upperMask |= (1L << i);
          }
          return this;
      }
docs: Sets a range of characters to 1s in the masks.
  
  @param min the minimum (inclusive).
  @param max the maximum (inclusive).
  @return {@code this}