- Retry S3 RequestTimeTooSkewed errors instead of immediately terminating. (Reported by sean0101n, Tim Garton, Jesper St John, Aleš Zelený.)
- Fix incorrect handling of transfer-encoding response to HEAD request. (Reported by Pavel Suderevsky.)
- Fix scoping violations exposed by optimizations in gcc 9. (Reported by Christian Lange, Ned T. Crigler.)
- Add repo-s3-port option for setting a non-standard S3 service port.
- The local command for backup is implemented entirely in C. (Contributed by David Steele, Cynthia Shang.)
- The check command is implemented partly in C. (Reviewed by Cynthia Shang.)