History of supersede 2 changes

In crates/hub/src/flow.rs, lines 554–561 on e4f1f52f292989309fd940d1f96fd99810feddef521b9881f5e668da5ac9ddd5. 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 554,561:crates/hub/src/flow.rs.