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While a normal set is theoretically sufficient, it can cause hard-to-reproduce
problems. In particular, the iteration order of the expansion result depends
on the iteration order of the requested targets. If there are multiple
requests for the same set of targets, but with different orders, the results
would depend on which request was made first. If a downstream function also
inadvertantly depends on the iteration order, it can be hard to debug why it
ended up with a different order than it requested.
Alternatively, we could sort the result before returning it. We generally
expect the key set to be smaller than the result set, so this should be
ever so slightly more efficient.
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MOS_MIGRATED_REVID=105765514
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