RavenDB Bug getting DateTimeOffset value from metadata

Tests.cs

using System;
using Raven.Client.Embedded;
using Raven.Json.Linq;
using Xunit;

namespace RavenTests
{
    public class Tests
    {
        [Fact]
        public void Test()
        {
            var documentStore = new EmbeddableDocumentStore { RunInMemory = true };
            documentStore.Initialize();

            var someDate = new DateTimeOffset(2012, 1, 1, 0, 0, 0, TimeSpan.Zero);

            using (var session = documentStore.OpenSession())
            {
                // Add some data
                var ball = new Ball { Id = "balls/1", Color = "Red" };
                session.Store(ball);

                // Give it a metadata value that is a DateTimeOffset
                var metadata = session.Advanced.GetMetadataFor(ball);
                metadata.Add("SomeDate", RavenJToken.FromObject(someDate));

                session.SaveChanges();
            }

            using (var session = documentStore.OpenSession())
            {
                var ball = session.Load<Ball>("balls/1");
                var metadata = session.Advanced.GetMetadataFor(ball);

                // This line fails with the message:  Invalid cast from 'System.String' to 'System.DateTimeOffset'.
                var dt = metadata.Value<DateTimeOffset>("SomeDate");
                
                Assert.Equal(someDate, dt);
            }
        }
    }

    public class Ball
    {
        public string Id { get; set; }
        public string Color { get; set; }
    }
}