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Meta's fork/rewrite of hg, Sapling hasn't gone anywhere yet because it needs EdenFS and Mononoke that aren't yet/maybe never FOSS. It's only called hg internally because of legacy reasons but it's completely different.

Microsoft hired a git maintainer to improve large repo performance and so it's better than it was.

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Sapling can use Mononoke, but it can also use Git repositories as the underlying storage layer with no server at all, and it does so by default in the OSS build. You can use it just fine with GitHub today, but there are rough edges.

My understanding is that the work to support OSS builds of Mononoke+EdenFS is happening, but there's no exact timeline right now because (from what I can tell) they basically have to abstract out and write new production storage components for the metadata/object layer, as they can't use their internal ones, obviously.

I’ve been using the sapling CLI as my frontend with github as my backend and finding it quite delightful - all the UX niceness from mercurial (and then some), while still being totally compatible with the rest of my team :)

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