Verk.SortedSet.range-exclamation-mark

You're seeing just the function range-exclamation-mark, 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()) :: nil

Lists jobs from start to stop, raising if there's an error.