If this is a faster and drop-in replacement, why doesnt the git project just use this? Sentences like "This isn’t strictly necessary for many rebases, and can be quite slow on sizable repos." kind of scare me.
Upstream Git is working on the underlying machinery to make this possible (merge-ort, sparse indexes), but they have a lot more workflows to accommodate and code to update. The fact that I don't have to worry about preserving all the existing workflows means that I can just say "I have decided to represent indexes differently in-memory, and it took me 1 day to do so."
git-move itself has no conflict resolution mechanism, and falls back to git-rebase if there are merge conflicts. So the git project cannot "just use this" as-is.
