The assumption is that the bus driver will take care of cleaning up all
the children before unregistering the parent. This place a bit more
responsibility on the bus driver, but it keeps it simple in the core.
That's not to say that it can't change in the future, but I don't want to
take that step right now. There are a lot of implications WRT locking and
recursion that need to be worked out, and I'd rather wait on making these
kind of core changes.
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