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Exporting an enum requires putting an export annotation on each item 
separately. Furthermore, the implicit members, such as the values() method, 
cannot be exported.

Thanks to Vincent Goossens for reporting this issue.

The best approach is probably to automatically export all items and all 
implicit members of an exported enum.

Consider the following capsule (not fully shown):

@SystemAPI
public class Superclass {
    @SystemAPI
    public void foo() {}
}

@SystemAPI
public class Subclass extends Superclass {}

Consider the following client code (outside the capsule) (not fully shown):

Subclass subclass = new Subclass();
subclass.foo();

The subclass.foo() call is reported as an error by the capsules checker.

This behavior does not make much sense since the client can access the method 
anyway through the following code, which is accepted as correct by the checker:

((Superclass)subclass).foo();

Thanks to Vincent Goossens for reporting this issue.

The requirement that all packages of a capsule are below a single root package 
means that many existing codebases need to be rearranged before the capsules 
toolkit can be applied to them.