History of backfill 2 changes

In crates/hub/src/diffusion.rs, lines 193–205 on d366306dae7d601bf141448c5454b89299847bb45ce14f84a23ffd13906a1c24. 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 193,205:crates/hub/src/diffusion.rs.