code: private static String formatValue(Object value) {
  		if (value == null) {
  			return null;
  		}
  
  		return value instanceof CharSequence ? "\"" + value + "\"" : value.toString();
  	}
docs: Format value:
  <ul>
  <li>Returns {@code null} if {@code value} is null.</li>
  <li>Wrapped value inside double quote if it is a string value.</li>
  <li>Returns the result of {@code toString} function otherwise.</li>
  </ul>
  
  @param value The value to raw.
  @return The formatted value.