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[p2-dev] Interfaces for metadata classes

I noticed that the concrete metadata classes that we created interfaces for are still in the provisional API package. Since we have interfaces to form the API spec, and a factory method for creating instances, the concrete classes can now be moved into internal packages. In fact if we don't, a client could reasonably downcast to the concrete API class, which would break with a different implementation. Was this an oversight, or just staging the changes to make sure we fixed up all references before moving the classes? I vaguely remember a dicussion about this but couldn't see anything in the bug report about it.