[RFC] set based apis...

[Robert Collins]

I'd like to start a pattern of methods that deal with historical data.
The pattern is to query for sets, and return iterators that are self
describing so that the returned order can vary from the requested one.
We should allow the order to be defined only when it really matters -
but when we allow it we probably want to allow it all the way down.

This is to allow effective read coalescing and index scanning without
requiring in-memory sort by the lowest layers.

Thoughts?

-Rob
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