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