Comment 1 for bug 609288

I'm also not sure about whether this is core or not. Bisecting them seems like a bit of extra effort that could be solved by humans just being notified. I think something like an atomic Tarmac command that would actually queue merges would be awesome, but we are running out of states to put an MP in that Tarmac can understand. If we want this, we need merge queues in Launchpad.