static UnsafeHashSet *Set(params int[] values)
        {
            var c = UnsafeHashSet.Allocate <int>(values.Length * 2);

            for (int i = 0; i < values.Length; ++i)
            {
                UnsafeHashSet.Add(c, values[i]);
            }

            return(c);
        }
        public void FreeDynamicSet()
        {
            var s = UnsafeHashSet.Allocate <int>(2, false);

            UnsafeHashSet.Free(s);
        }
        public void FreeFixedSet()
        {
            var s = UnsafeHashSet.Allocate <int>(2, true);

            UnsafeHashSet.Free(s);
        }