=begin
Currently Open Struct doesn't format it's YAML output exposing ((|@table|)). It also doesn't create setters and getter like (({#marshal_load})). This patch does both.
=end
This reasoning would also apply to all stdlib classes, like Set, Matrix, ... right?
I'm not sure it's a big issue, but a patch like this would make yaml serialization both backwards and forwards incompatible. It would be easy to make it at least backwards compatible.