code: @Override
      public MonetaryAmount apply(MonetaryAmount amount) {
          requireNonNull(amount, "Amount required.");
          NumberValue num = amount.getNumber();
          BigDecimal one = ONE.setScale(num.getScale() < 5 ? 5 : num.getScale(), HALF_EVEN);
          BigDecimal reciprocal = one.divide(num.numberValue(BigDecimal.class), HALF_EVEN);
          return amount.getFactory().setNumber(reciprocal).create();
      }
docs: Gets the amount as reciprocal / multiplicative inversed value (1/n).
  <p>
  E.g. 'EUR 2.0' will be converted to 'EUR 0.5'.
  
  @return the reciprocal / multiplicative inversed of the amount
  @throws ArithmeticException if the arithmetic operation failed