code: public static LongBinding round(final ObservableDoubleValue a) {
          return createLongBinding(() -> Math.round(a.get()), a);
      }
docs: Binding for {@link java.lang.Math#round(double)}
  
  @param   a   a floating-point value to be rounded to a
  {@code long}.
  @return  the value of the argument rounded to the nearest
  {@code long} value.