Spear.Connection.fetch_subscription

You're seeing just the function fetch_subscription, go back to Spear.Connection module for more information.
Link to this function

fetch_subscription(s, monitor_ref)

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Specs

fetch_subscription(
  %Spear.Connection{
    config: term(),
    conn: term(),
    keep_alive_timer: term(),
    requests: term()
  },
  reference()
) ::
  {:ok,
   %Spear.Connection.Request{
     buffer: term(),
     continuation: term(),
     from: term(),
     monitor_ref: term(),
     request_ref: term(),
     response: term(),
     rpc: term(),
     status: term(),
     type: term()
   }}
  | :error