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Improvement
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Resolution: Fixed
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Normal
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None
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None
Import of http://bugs.musicbrainz.org/ticket/3484
That ticket said "They're (probably) not used by anyone and the AR type says it all."
I'd add that when used, they're used for nonsense in 99% of the cases.
Removing this from the database is a schema change, but hiding them in the UI is not and could be done earlier if wanted.