Rails 3: The land of undocumented regressions

Coming from Rails 2 land?  Upgrading? Do you serialize any objects in ActiveRecord models?  

If it’s doesn’t act like a Date or a Time, and isn’t a Hash or an Array, you’re fucked.  That’s right.  AREL (the new cool kid) will only serialize those object types.

A fact which is mentioned in exactly one place, the code itself.

Thanks, Rails 3, thanks a fucking lot.

—edit—

At least it was an actual bug, and it’s fixed now.

https://rails.lighthouseapp.com/projects/8994/tickets/5525-after-update-to-rails-300-release-serialization-seems-to-be-broken