@Override
 public DoubleArrayAssert usingDefaultComparator() {
   super.usingDefaultComparator();
   this.arrays = DoubleArrays.instance();
   return myself;
 }
 @Override
 public DateAssert usingDefaultComparator() {
   super.usingDefaultComparator();
   this.dates = Dates.instance();
   return myself;
 }
 @Override
 public S usingDefaultComparator() {
   super.usingDefaultComparator();
   this.strings = Strings.instance();
   return myself;
 }