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The WebSocket chat example uses a `Collections.synchronizedSet` but we can't use `synchronize` in suspend functions. I need to send frames to the connected clients from other coroutines. How do I synchronize the access to the data structures of my server and the `DefaultWebSocketServerSession`? Do you use the experimental `Mutex` for this purpose?

Is keeping WebSocket connections and broadcasting information to them from other coroutines something ktor designed to do, by the way, or am I just using the wrong tool?

Why does the chat examples uses a `Collections.synchronizedSet` but does not synchronize when iterating over the items of the set using `forEach`?