History of build 21 changes

In crates/hub/src/lib.rs, lines 91–144 on 1d634f698ecd59f20847877c4e119ed717c47c6c0e4bde499c9e1fb7fbbd3c61. 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.