This has been discussed quite a bit and it's not something that we are prepared to do, the reasoning being that "Not a bug" and "Duplicate" are synonyms of "Closed" and would only create noise in the the bug list.
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This has been discussed quite a bit and it's not something that we are prepared to do, the reasoning being that "Not a bug" and "Duplicate" are synonyms of "Closed" and would only create noise in the the bug list.