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(.module:
  [lux #*
   [abstract
    [equivalence (#+ Equivalence)]]
   [data
    [binary (#+ Binary)]
    ["." sum]
    ["." product]]]
  ["." /// #_
   ["#." hash (#+ Hash SHA-1 MD5)]])

(type: #export Status
  #Unverified
  (#Partial (Either (Hash SHA-1)
                    (Hash MD5)))
  (#Verified (Hash SHA-1) (Hash MD5)))

(structure: any_equivalence
  (Equivalence Any)

  (def: (= _ _)
    true))

(def: #export equivalence
  (Equivalence Status)
  ($_ sum.equivalence
      ..any_equivalence
      ($_ sum.equivalence
          ///hash.equivalence
          ///hash.equivalence
          )
      ($_ product.equivalence
          ///hash.equivalence
          ///hash.equivalence
          )
      ))

(def: #export (verified payload)
  (-> Binary Status)
  (#Verified
   (///hash.sha-1 payload)
   (///hash.md5 payload)))