It was the default workflow when people used to share patch files as attachments on community forums. You could only diff your changes to the latest tip and sen

It was the default workflow when people used to share patch files as attachments on community forums. You could only diff your changes to the latest tip and send these changes to the maintainer as a “fast forward” merge. If the patch broke, you fixed it locally (rebase) and attached a new version for the maintainers to apply.