History of finish 6 changes

In crates/hub/src/flow.rs, lines 638–686 on dbcb0b813caacaa4c918b57fbeb64879c39ea338fba2a042ab5159213ec7f77e. 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 638,686:crates/hub/src/flow.rs.