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// about is that *some* unit is, or is not, keeping the service from
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// being removed: the difference between 1 unit and 1000 is irrelevant.
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notLastRefs = append(notLastRefs, bson.D{{"unitcount", bson.D{{"$gt", 0}}}}...)
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notLastRefs = append(notLastRefs, bson.D{{"unitcount", 0}}...)