.NET: Thin Client: deserializing DateTime fields causes BinaryTypeGet request for every value

public class CacheDateTimeMetaTest : ClientTestBase
    {
        [Test]
        public void TestDateTimeMeta()
        {
            var data = Enumerable.Range(1, 5)
                .Select(x => new Foo
                {
                    Id = x,
                    StartDate = DateTime.Now.AddHours(x),
                    EndDate = DateTime.Now.AddDays(x)
                });

            var cache = Client.GetOrCreateCache<int, Foo>("foo");
            cache.PutAll(data.Select(x => new KeyValuePair<int, Foo>(x.Id, x)));

            var res = cache.Query(new ScanQuery<int, Foo>()).GetAll();
            Assert.AreEqual(cache.GetSize(), res.Count);
        }

        public class Foo
        {
            public int Id { get; set; }
            public DateTime? StartDate { get; set; }
            public DateTime? EndDate { get; set; }
        }
    }