History of build 4 changes

In crates/hub/src/lib.rs, lines 41–63 on 736f6813543dc894c86ff87bc185502b4bd254ca023bd66af8bb869134e08c81. 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 41,63:crates/hub/src/lib.rs.