API change: service state nodes

[Gustavo Niemeyer]

> It's really just that I don't see the benefits of storing an
> intermediate format -- we'll collapse all the constraints into a single

Ok, given that there will be some first-class objects for dealing with
that data, it shouldn't make much of a difference indeed, and perhaps
will even make the implementation simpler, so +1.

-- 
Gustavo Niemeyer
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-- I'm not absolutely sure of anything.