用CamelCasePropertyNamesContractResolver转换TimeZoneInfo错误

当我尝试将TimeZoneInfo对象转换为CamelCasePropertyNamesContractResolver的JToken时，我的单元测试失败了。所有属性名都不是小写的。奇怪的是，这只影响TimeZoneInfo，而不是其他类，如KeyValuePair(我测试过的类)。我不确定如果我做错了，或者如果它是一个错误与json.net。我在c# 4.0的旧版本和最新版本6.0.3中尝试过，两者都表现出相同的行为。

  [TestMethod]
  public void TimeZoneInfoConvertedCorrectly()
  {
     JToken actual2 = JToken.FromObject(new KeyValuePair<string, string>("test", "test2"), JsonSerializer.Create(
        new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() }));
     // these don't fail
     Assert.AreEqual(new JValue("test"), actual2["key"]);
     Assert.AreEqual(new JValue("test2"), actual2["value"]);
     JToken actual = JToken.FromObject(TimeZoneInfo.Utc, JsonSerializer.Create(
       new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() }));
     // should fail but doesn't, right?
     Assert.IsNull(actual["BaseUtcOffset"], "All the properties should be camel cased");
  }