History of plan 2 changes

In crates/hub/src/diffusion.rs, lines 460–480 on aa0bfbd11f02d9df4d579f4e8b0f0890d73629bc857878c414e882ebc42d3e85. 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 460,480:crates/hub/src/diffusion.rs.