verl.between

You're seeing just the function between, go back to verl module for more information.
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between(Vsn1, Vsn2, VsnMatch)

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Specs

between(version(), version(), version()) ::
  boolean() | {:error, :invalid_version}
Helper function that returns true if the first version is greater than the third version and also the second version is less than the the third version, otherwise returns false. See compare/2 for more details.