History of backfill 2 changes

In crates/hub/src/diffusion.rs, lines 193–205 on 7c06f5b28ade52fa5ab62f2e221621ce5dc1033f17c1992e9e6e23265e62c253. 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.