We haven't patched serialization yet, since we're still making a lot of changes to the base code.
We could spend a lot of time making sure it works perfectly, only to have to break it again and again whenever we have to fix bugs or refactor code in other areas. It's a better use of our time to get the code base stable, and then focus on making the serialization work correctly after that. (This is one of the reasons we're still in Alpha)