⊦ r1 ≠ r → getbytearray(r1, st[r -- sk, val]) = getbytearray(r1, st)
[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ r = rk .ref ∧ sk = rk .key ↔ rk = r -- sk])], [EXTRATERMS : (rk, r, sk)]]