code: public BeanComparator caseSensitive() {
          if ((mFlags & 0x04) != 0) {
              // Already case-sensitive.
              return this;
          }
          BeanComparator bc = new BeanComparator(this);
          bc.mOrderByName = mOrderByName;
          bc.mUsingComparator = mUsingComparator;
          bc.mFlags = mFlags | 0x04;
          return bc;
      }
docs: Override the collator and compare just the last order-by property using
  {@link String#compareTo(String) String.compareTo}, if it is of type
  String. If no order-by properties have been specified then this call is
  ineffective.
  <p>
  A {@link #using using} Comparator disables this setting. Passing null to
  the using method will re-enable a case-sensitive setting.