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BroadcastChannels with non-zero capacity: are messages sent before anyone subscribes dropped? Or do they sit in the queue?

When a channel's queue is full, calling `send()` will suspend (calling `offer()` won't suspend, but drops instead).

Understood. I'm just curious if, with a BroadcastChannel, what happens to a message if nobody has called openSubscription(), so there are no receive channels created. Are the messages buffered and then released when somebody does call openSubscription()? Or are they just dropped?

Channels are always hot. Flow share operator is not there yet, there's an issue on GitHub for it.

`ArrayBroadcastChannel` will drop anything sent to it when there are no subscribers. 

`ConflatedBroadcastChannel` will always cache the latest value sent to it, even if there are no subscribers.