In the top state, o-supported operator preferences
(best, better, worse, worst, binary indifferent, unary
indifferent) will be permanently `leaked' after the
operator has been reconsidered.
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Okay, so I'm an idiot. This bug is invalid, because the only
way that these preferences can get created is if they're
returned from a substate as o-supported: this currently
happens because I haven't implemented chunking.