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Evolution Notes
Lots of rules for compatible/incompatible changes
Arun built a test of all basic changes including writeObject/readObject, but it took weeks to run, so hasn't been run in a year. About 10 classes were taken as a quick look matrix.
We haven't tested writeReplace/readResolve very much
We haven't tested inner classes and inner class evolution
We haven't tested evolving superclasses very much
We haven't tested optional data semantics very much