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(.module:
  [library
   [lux "*"
    [abstract
     [equivalence {"+" [Equivalence]}]]
    [data
     ["[0]" product]
     ["[0]" text
      ["%" format]]]]]
  ["[0]" /// {"+" [Snapshot]}
   ["[1][0]" time]
   ["[1][0]" stamp]])

(type: .public Value
  (Record
   [#version Text
    #snapshot Snapshot]))

(def: .public equivalence
  (Equivalence Value)
  ($_ product.equivalence
      text.equivalence
      ///.equivalence
      ))

(def: separator
  "-")

(def: .public snapshot
  "SNAPSHOT")

(def: .public (format (^slots [#version #snapshot]))
  (%.Format Value)
  (case snapshot
    #///.Local
    version
    
    (#///.Remote stamp)
    (let [(^slots [#///stamp.time #///stamp.build]) stamp]
      (%.format (text.replaced ..snapshot
                               (///time.format time)
                               version)
                ..separator
                (%.nat build)))))