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Document that a many-to-many pair gets one join row where 3.x wrote one per listing - #479
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A model related twice through the same many-to-many relation, e.g. with
#idand#refor the same{ id }listed twice, gets one join row in 4.0, where 3.x wrote one join row for each listing. The migration guide said the opposite; it and the changelog now say so.