❔ Nullability issue

        public bool Equals(Money money)
        {
            if (money is null)
            {
                return false;
            }

            if (ReferenceEquals(this, money))
            {
                return true;
            }

            return Currency.CurrencyCode == money.Currency.CurrencyCode && Amount == money.Amount;
        }

        public bool Equals(Money money)
        {
            if (money is null)
            {
                return false;
            }

            if (ReferenceEquals(this, money))
            {
                return true;
            }

            return Currency.CurrencyCode == money.Currency.CurrencyCode && Amount == money.Amount;
        }