Against a real bus: three asks, two machines; each takes one, the third waits until one is free
and then goes to that one; a machine that stops leaves nothing taken twice. The redelivery of an
ask a dead machine held is the ack wait's, proven by the hand-back test beside this one.
And the order a live mesh switches over in, written where the role is named: queued builds first,
then this controller, then build-agent assigned where machines build, then the builder and the old
seat's stream forgotten.
jochen
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