code: public static IntegerBinding decrementExact(final ObservableIntegerValue a) {
          return createIntegerBinding(() -> Math.decrementExact(a.get()), a);
      }
docs: Binding for {@link java.lang.Math#decrementExact(int)}
  
  @param a the value to decrement
  @return the result
  @throws ArithmeticException if the result overflows an int