introduce ReceiveBroadcastChannel

[SalomonBrys]

In an interface, we can declare something like this:

interface Whatever {
    val input: SendChannel<Input>
    val output: ReceiveChannel<Output>
}

Now, I need output to be a BroadcastChannel.
The problem with the interface BroadcastChannel is that it is also a SendChannel.
I would like to give the view the possibility to subscribe to the broadcast, but not to send to or cancel the channel.

I think an interface like this would be very usefull:

interface ReceiveBroadcastChannel<T> {
    fun openSubscription(): ReceiveChannel<E>
}

[fvasco]

Are you seen #274?

[SalomonBrys]

No, sorry :(
I did make a search before posting this, but on issues and not on PRs.
my bad ;)