Message Pack CLI issue #27 reproducible code

TestMsgpackCli001.cs

using System;
using System.IO;
using System.Linq;
using MsgPack.Serialization;

namespace TestMsgpackCli001
{
    using System.Collections.Generic;

    namespace TestMsgpackCli001
    {

        public class SomeOne
        {
            public string Target;
            public IDictionary<string, string> Data;
        }

        internal class Program
        {
            private static void Main(string[] args)
            {
                var h = new SomeOne
                {
                    Target = "boo",
                    Data = new Dictionary<string, string>()
                };
                h.Data.Add(new KeyValuePair<string, string>("foo", "woo"));

                var b = h.Pack();
                var h2 = b.UnPack<SomeOne>();
                Console.WriteLine("{0},{1}", h2.Target, string.Join(",", h2.Data.Select(pair => string.Format("{0}=>{1}", pair.Key, pair.Value))));
            }
        }


        public static class Extentions
        {
            public static byte[] Pack<T>(this T data)
            {
                var serializer = MessagePackSerializer.Create<T>();
                var stream = new MemoryStream();
                serializer.Pack(stream, data);
                return stream.ToArray();
            }

            public static T UnPack<T>(this byte[] data)
            {
                var serializer = MessagePackSerializer.Create<T>();
                var stream = new MemoryStream(data);
                return serializer.Unpack(stream);
            }
        }
    }
}