session.Store(entity, etag) ignores the etag if the entity is the session

SessionStoreIgnoresEtag.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Raven.Client.Document;
using Raven.Client.Embedded;
using Raven.Client;

namespace Test
{
	public class Foo
	{
		public string Id { get; set; }
		public string Name { get; set; }
	}

	class Program
	{
		static IDocumentSession currentSession;

		static void Main(string[] args)
		{
			
			using (DocumentStore store = new EmbeddableDocumentStore { RunInMemory = true })
			{
				store.Initialize();
				using (var session = store.OpenSession())
				{
					session.Advanced.UseOptimisticConcurrency = true;
					
					session.Store(new Foo
					{
						Id = "Foos/1",
						Name = "Foo"
					});

					session.SaveChanges();

				}
				using (var session = store.OpenSession())
				{
					session.Advanced.UseOptimisticConcurrency = true;
					currentSession = session;
					var foo1 = session.Load<Foo>("Foos/1");
					foo1.Name = "Other name";
					var etag = Guid.Parse("{00000000-0000-0000-0000-000000000001}");

					// If I remove Evict no ConcurrenyException is raised
					session.Advanced.Evict(foo1);
					session.Store(foo1, etag);

					session.SaveChanges();
				}
			}
		}
	}
}