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Projects back then did not use pull requests because that is a concept created by GitHub.

Apologies, I forgot to use the more general term.

FOSS projects didn’t always have a standard process for Fagan inspections.

the original pull request was an email to the upstream developer to run "git pull your-repo your-branch".

the concept is at least as old as git itself, possibly even older. github just created a webinterface for it.