We can get peerAvailability === false in Android
We can get peerAvailability === false in Android

For some reason I thought that Android never sends a nonTCPPeerAvailability
event wiht availability === false. It turns out we do. We have a heuristic
where if we don't discover a peer for a minute then we will announce they
have gone. For now we will just accept this heuristic at face value and
honor it.

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