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Our algorithm gives lots of credit to removing old lines of code!

But to your broader point, I think there certainly is information about effort at the code level. Consider for example these two PRs: https://github.com/PostHog/posthog/pull/23858 and https://github.com/microsoft/vscode/pull/209557. It's pretty easy to tell which one was more effort even if you don't know anything about the process for how they were implemented.

Do you have any shareable examples you want me to test out? Or of course you can try it yourself :)