History of build 21 changes

In crates/hub/src/lib.rs, lines 91–144 on e5acd2a2ceb5bb8817185afba1e534bbc739758113eb0e92cae108c2435e250a. 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 91,144:crates/hub/src/lib.rs.