Serialization of Dictionary<string, object>

gistfile1.cs

using System.Collections.Generic;
using Newtonsoft.Json;
using NUnit.Framework;
using ServiceStack.Text;
using JsonSerializer = ServiceStack.Text.JsonSerializer;

namespace Tests
{
    [TestFixture]
    public class TestJsonSerialization
    {
        private static Dictionary<string, object> SetupDict()
        {
            return new Dictionary<string, object> {
                { "a", "text" },
                { "b", 32 },
                { "c", false },
            };
        }

        private static void AssertDict(Dictionary<string, object> dict)
        {
            Assert.AreEqual("text", dict["a"]);
            Assert.AreEqual(32, dict["b"]);
            Assert.AreEqual(false, dict["c"]);
        }

        [Test]
        public void Test_JsonNet()
        {
            var dict = SetupDict();
            var json = JsonConvert.SerializeObject(dict);
            var deserializedDict = JsonConvert.DeserializeObject<Dictionary<string, object>>(json);
            AssertDict(deserializedDict);
        }

        [Test]
        public void Test_ServiceStack_Text_TypeSerializer()
        {
            var dict = SetupDict();
            var json = TypeSerializer.SerializeToString(dict);
            var deserializedDict = TypeSerializer.DeserializeFromString<Dictionary<string, object>>(json);
            AssertDict(deserializedDict);
        }

        [Test]
        public void Test_ServiceStack_Text_JsonSerializer()
        {
            var dict = SetupDict();
            var json = JsonSerializer.SerializeToString(dict);
            var deserializedDict = JsonSerializer.DeserializeFromString<Dictionary<string, object>>(json);
            AssertDict(deserializedDict);
        }
    }
}

Your test is incomplete:
(object)ints will be deserialized as longs, and floats as doubles.