+ (foldable explicit-check always-translatable))
+(defknown data-vector-ref-with-offset (simple-array index fixnum) t
+ (foldable explicit-check always-translatable))
+(defknown data-vector-set (array index t) t
+ (unsafe explicit-check always-translatable))
+(defknown data-vector-set-with-offset (array index fixnum t) t
+ (unsafe explicit-check always-translatable))