I prefer immutability but it really doesn't matter. There's no reason to have both tags though, so pick one and stuff the other one inside it. (If you can black-list the alternative might be good afterwards)
Navigate! immutable immutability
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2There's no need to blacklist the alternative. Once the synonym is set up if anyone tries to use the "wrong" version it will be automatically converted to the "right" one. – ChrisF♦ Mar 27 '13 at 14:33
Done.
