[MemoryDiagnoser]
    public class BM
    {
        enum E
        {
            a,
            b,
            c
        }

        E val;

        [GlobalSetup]
        public void Setup()
        {
            val = new Random().NextDouble() > .5 ? E.b : E.c;
        }

        [Benchmark]
        public long Cast() => Propagate((long)val);

        [Benchmark]
        public long IConvertible() => CastViaIConvertible(val);

        [Benchmark]
        public long EnumUtilsCast() => EnumUtils<E>.Cast(val);

        static long CastViaIConvertible<T>(T val) where T : struct, IConvertible
        {
            return val.ToInt64(null);
        }

        static long Propagate<T>(T val) where T : IConvertible
        {
            return val.ToInt64(null);
        }
    }