Yggdrasil.Subscriber.Manager.subscribed-question-mark

You're seeing just the function subscribed-question-mark, go back to Yggdrasil.Subscriber.Manager module for more information.
Link to this function

subscribed?(channel, pid \\ nil)

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Specs

subscribed?(Yggdrasil.Channel.t(), nil | pid()) :: boolean()

Whether the pid is subscribed or not to the channel.