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I have a use case for `BroadcastChannel` but I'm not sure how to expose it. Should I literally expose the `BroadcastChannel` for users to call `openSubscription()` or should I wrap this up?

`BroadcastChannel` includes both the read side and the write side. Assuming you don't want your API consumers to be able to send their own values, it's better to keep the channel private. The read half of `BroadcastChannel` naturally maps to a `Flow`, and there's an extension function to convert it: `asFlow()` (there was even talk of making `BroadcastChannel` implement `Flow` directly for a while).