Shouldn't http://meta.stackoverflow.com/questions?sort=unanswered redirect to http://meta.stackoverflow.com/unanswered instead? (Same for all SE sites of course)
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No they shouldn't because they are two different views.
http://meta.stackoverflow.com/unanswered points to questions that have zero answers.
http://meta.stackoverflow.com/questions?sort=unanswered points to questions that do not have accepted answers.