code: public static BooleanBinding isNaN(final ObservableDoubleValue observableValue) {
          return Bindings.createBooleanBinding(() -> Double.isNaN(observableValue.get()), observableValue);
      }
docs: A boolean binding that is `true` if the given observable double is **Not a Number**.
  See {@link Double#isNaN(double)}.
  
  @param observableValue the observable double value to use for the binding.
  @return the boolean binding.