PeerDAS with significantly less bandwidth consumption

The author proposes a PeerDAS variant that cuts per-node bandwidth by 56.2%, from 64*C to 28*C bytes per slot with the spec parameters D=8, K=2 and S=8. Nodes would subscribe to only K=2 GossipSub topics and, for their remaining sampled columns, wait for peers to notify them and then request each column from one peer, moving to the next peer after a 400 ms timeout. The text says K=4 would still give a 37.5% reduction, and that the design guarantees only one copy per non-subscribed column, unlike IDONTWANT, which cannot guarantee a fixed copy count.