Comment #1 on issue 458 by dav.co...@gmail.com: Remove clone() from all interfaces, it is wrong; make them extend Cloneable, instead.
http://code.google.com/p/protobuf/issues/detail?id=458

Actually, the problem is in Java itself. The Object#clone() method declared as protected, and this causes "&" operator to fail. The easiest (but not the most elegant solution) is to have some T cloneMe() method in the interfaces. If Cloneable is also desirable, it's fine. The implementing class then supposed to implement both methods, clone() and cloneMe(). Also, in this case clone() method might be declared protected to avoid the confusing of having both public methods doing essentially the same.

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