code: public static IntegerBinding floorDiv(final ObservableIntegerValue x, final ObservableIntegerValue y) {
          return createIntegerBinding(() -> Math.floorDiv(x.get(), y.get()), x, y);
      }
docs: Binding for {@link java.lang.Math#floorDiv(int, int)}
  
  @param x the dividend
  @param y the divisor
  @return the largest (closest to positive infinity)
  {@code int} value that is less than or equal to the algebraic quotient.
  @throws ArithmeticException if the divisor {@code y} is zero