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It looks like the author takes patch submissions and applies them, rather than pull requests being merged. Detailed in: https://github.com/vim/vim/blob/master/CONTRIBUTING.md

Wow, that's pretty lame. No one gets attribution for their work.

He does put the name of the contributor in the commit message.

Ah, you're right. I only looked at a few patches in the log:

And most of them don't have a name.