code: protected final Stringifier<Double> registerDoubleStringifier(String name, Stringifier<Double> doubleStringifier) {
  		compositeStringifier.add(Double.class, name, doubleStringifier);
  		compositeStringifier.add(Double.TYPE, name, doubleStringifier);
  		return doubleStringifier;
  	}
docs: Register a stringifier for Double and double values.