rescue_from not working with subscribed method on ActionCable channel about rails HOT 2 OPEN

It looks like for channels, only public actions declared by the user are rescue-able and not callbacks like #subscribed:

For connections since the test works, I think there isn't a problem here.
There is already a test for this:

Maybe we could add a test for not supporting rescue_from in non-user callbacks (like subscribed).

from rails.

only public actions declared by the user are rescue-able

Looks like only #subscribed and #unsubscribed are not rescue-able.

You can still use rescue_from by doing something like this:

def subscribed
    # ...
rescue StandardError => e
    rescue_with_handler(e)
end

But I still find it a bit confusing that these two actions are exceptions to rescue_from, as their behavior is defined inside the channel.

This is the current #subscribe_to_channel method which calls #subscribed:

Maybe using rescue_with_handler in this method could be a good solution?

def subscribe_to_channel
  run_callbacks :subscribe do
    subscribed
  end
rescue Exception => exception
  rescue_with_handler(exception) || raise
ensure
  reject_subscription if subscription_rejected?
  ensure_confirmation_sent
end

And something similar with #unsubscribe_from_channel.

from rails.