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Sapling originated from the Mercurial open source project, which was largely Python (at the time).

Just to finish up, most of Mercurial has been rewritten in Rust, although the Python version is still the default install.

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It's difficult to find out information about the status of the oxidation project with Mercurial. I just noticed the 6.3 release earlier today and looked more into the rust support. I didn't get the feeling that most of Mercurial has been rewritten in Rust yet. The `hg help rust` information only lists a handful of features as gaining improvements from Rust, albeit they are likely core/essential components, as well as mentioning some/all of the work is experimental. The documentation here seems very much directed towards developers still.

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