History of keep 6 changes

In crates/hub/src/coverage.rs, lines 598–653 on v0.9.16. 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 598,653:crates/hub/src/coverage.rs.