| http://www.w3.org/ns/prov#value | - When you delete from a vector, the array you get back may not be expressly adjustable anymore -- you can still call adjust-array on it but this may cause a copy to occur in order to do the adjustment. (Which, in my opinion, is sort of like claiming that everyone can fly as long as you do not care how hard they hit the ground when they land...).
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