X3m.System.GenAggregateMod.handle_msg

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

handle_msg(pid, atom, arg3, arg4)

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Specs

handle_msg(pid(), atom(), X3m.System.Message.t(), Keyword.t()) ::
  {:ok, X3m.System.Message.t(), any()} | any()