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