History of S3::creds 1 change

In crates/hub/src/backups.rs, lines 540–584 on 8f1d76f4169ab0ad61c184b6889680cfe0da3d6b626f1b29f58e1b33a7903319. 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 540,584:crates/hub/src/backups.rs.