should "protected worker" concept check for BroadcastChannel?

[wanderview]

Currently the "protected worker" concept lists a number of conditions:

https://html.spec.whatwg.org/multipage/workers.html#protected-worker

A worker is said to be a protected worker if it is an active needed worker and either it has outstanding timers, database transactions, or network connections, or its list of the worker's ports is not empty, or its WorkerGlobalScope is actually a SharedWorkerGlobalScope object (i.e. the worker is a shared worker).

I believe the goal here is to avoid GC'ing orphan workers whose existence can be observed from other contexts.

Should this list somehow include BroadcastChannel? I don't see any reference to it and AFAICT BroadcastChannel doesn't use entanged ports, so its not included that way.

[wanderview]

This would perhaps close one of the observable things mentioned in #2553.

[annevk]

I think you're correct that it needs to be listed.