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Even with submodules it's still a PR per repo. Global, atomic changes are super powerful.

There is another tool called git-subtree that should solve these problems, I think. But I've never seen it in use

git subtree is just a wrapper around subtree merges, I don't think they solve the same problem as submodules.

Good point! Hmm. Maybe git(hu|la)b could solve this with some kind of pull request batching.