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Proof step 27 from proof prepost-read-orphans (previous step)

is-encoded(orphans0, buf), n = # orphans0, # buf = # orphans0 * ENCODED_NAT_SIZE ⊦ ⟪persistence_io_decode_orphans#(n, buf; ; orphans, err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → orphans = orphans0))

Lemma prepost-decode-orphans