The documentation for Data.Version might be insightful:
http://haskell.org/ghc/docs/latest/html/libraries/base-4.2.0.0/Data-Version.html
If Cabal uses the parseVersion function to parse versions then the
following version is valid: "1.2.3-a-b-c". If should result in this
value:
Version {versionBranch = [1,2,3], versionTags = ["a", "b", "c"]}
But I don't know if Cabal allows you to depend on such a version.
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