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