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It was released, and was used for the Windows repo. Search "vfs for git" - it's open source.

Then macOS removed kernel extensions, so they came up with a different approach and released that too. Search "scalar" to see it.

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It may be useful to note that "scalar" is mostly (albeit not entirely) a git (auto) configuration tool using (now) built-in tools like sparse checkouts and sparse checkout "cones", it shows how much of Microsoft's improvements have made it upstream into git itself. (And it is a stated goal of "scalar" that everything eventually should be.)

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