code: public static DoubleBinding rint(final ObservableDoubleValue a) {
          return createDoubleBinding(() -> Math.rint(a.get()), a);
      }
docs: Binding for {@link java.lang.Math#rint(double)}
  
  @param   a   a {@code double} value.
  @return  the closest floating-point value to {@code a} that is
  equal to a mathematical integer.