In some ways it's a shame that java.lang.String is marked 'final' in Java. If it wasn't final, you could inherit from java.lang.String to create strings that had some extra features, or you could extend with a marker interface to declare that a String has some property, for example it would be neat to be able to track if a String had been Checked for dangerous characters from the web, Internationalized, or Processed by some system
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