Verk.SortedSet.range

You're seeing just the function range, go back to Verk.SortedSet module for more information.
Link to this function

range(key, start \\ 0, stop \\ -1, redis)

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Specs

range(String.t(), integer(), integer(), GenServer.server()) ::
  {:ok, [Verk.Job.T]} | {:error, Redix.Error.t()}

Lists jobs from start to stop.