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== Critique ==
A major problem with marker interfaces is that an interface defines a contract for implementing classes, and that contract is inherited by all subclasses. This means that you cannot "unimplement" a marker. In the example given, if you create a subclass that you do not want to serialize (perhaps because it depends on transient state), you must resort to explicitly throwing <code>NotSerializableException</code> (per <code>ObjectOutputStream</code> docs)
Another solution is for the language to support [[metadata]] directly:
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