Factorial

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        /// <summary>
        /// https://groophy-inc.github.io/factorial
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static GValue Factorial(GValue val)
        {
            IEnumerable<int> ints = Enumerable.Range(1, val.get_Int);
            return new GValue(ints.Aggregate((f, s) => f * s).ToString());
        }