Why should sorting be related to the primary key? You should be able to sort on any attribute. If you wanted to sort a set of people by age would it make sense to only retain one person of each age? Sort order and identity should be orthogonal. Besides, if you need a collection based on primary keys then a map or a sorted map is more appropriate, and if you chose a set instead you probably expect operations on that set to take into account the entire element.
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