History of propagate 2 changes

In crates/hub/src/diffusion.rs, lines 452–454 on f01cb865fc60230b8370579a98b7eac42de01abe2ac040d85bbd0acf03f9e80d. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 452,454:crates/hub/src/diffusion.rs.