docs: <V> String toJson(final DataTypeDescriptor<V> descriptor, final V arg) {
  		String s = format.write(arg, descriptor, false);
  		TypeEnum type = descriptor.getType();
  		if (type == TypeEnum.STRING || type == TypeEnum.ENUM || type == TypeEnum.DATETIME) {
  			// Remove the quotes.
  			s = s.substring(1, s.length() - 1);
  		}
  
  		return s;
  	}