In Noun::new(), you need to either defer blessing or re-bless after you've invoked SUPER::new(). Unless you do, Noun::new will return instances of Word.
This is not correct. The original author correctly designed the parent-class new constructor to bless based on the class it was called from-- in the case of the example above, Word::new will in fact bless the new object into the Noun class, because that is the value of $classname at that point.
--rjray
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