Any software of sufficient size and complexity has an essentially arbitrary number of bugs waiting to be discovered. The real question is, how well will the project do at recording and prioritizing those bugs? A project with a large and well-maintained bug database (meaning bugs are responded to promptly, duplicate bugs are unified, etc.) therefore makes a better impression than a project with no bug database, or a nearly empty database.
— Karl Fogel, Producing Open Source Software
“Unified” strikes me as a more positive term than “Marked as a duplicate”. Maybe we should use it in Bugzilla.