I love that posts closed as Off Topic and migrated to another site now say [migrated].
Can we do this for a [duplicate] as well? The distinction between a question closed as duplicate and one that is closed as not a real question, too localized, or otherwise "bad" is at least as big or maybe even bigger than those that are migrated.
Unless the original is also closed, then the duplicate is just as valid but already answered — and this would prevent users browsing the question lists from assuming anything else about the question (such as Weird, maybe X is off topic here?)