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Proof step 7 from proof junkref-put-refval-01 (
previous step
)
⊦ mkarraytype(ty) ≤ ty0 ↔ ty0 = mkclasstype(`java.lang.Object' .class) ∨ is_arraytype(ty0) ∧ ty ≤ ty0 .type
A spec-lemma