I knew about Fargo using approval voting (and I think that's awesome), but it surprised me that they used it in a multi-winner election. Using approval voting

I knew about Fargo using approval voting (and I think that's awesome), but it surprised me that they used it in a multi-winner election. Using approval voting for multi-winner can work, but it'll tend to produce winners who are ideological clones of each other, rather than something more like proportional representation. To give an example of what I mean, suppose 51% of the city is solidly for party A, and 49% is solidly for party B. If you run an election with two candidates of party A and two candidates of party B, and everyone votes according to their partisan preferences, then both the party A candidates win rather than, say, one A and one B. There are some proposed methods that extend approval voting to do something closer to proportional representation by weighting the votes of voters who have gotten one of their candidates elected less than ones who haven't, but I don't remember all the specific details. That said, I think this makes sense if having multiple winners is unusual (like there were two seats up this election rather than one because someone left office before their term was up), or if there's a bunch of commissioners who are replaced in stages like U.S. Senators, and it would be weird to make results proportional within each "class" but not proportional overall. Anyone know the full story here?