X3m.System.Aggregate.Repo.stream_events

You're seeing just the callback stream_events, go back to X3m.System.Aggregate.Repo module for more information.
Link to this callback

stream_events(stream_name, start_at, per_page)

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Specs

stream_events(
  stream_name :: String.t(),
  start_at :: non_neg_integer(),
  per_page :: pos_integer()
) :: Enumerable.t()