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Rust Digger: More than 14% of crates configure rustfmt. 35 have both rustfmt.toml and .rustfmt.toml
(rust-digger.code-maven.com)
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GitHub has a massive majority here with "no repository" being larger than any competitor (a lot of those are probably Github, just not in the toml file).
This makes me sad. I wish alternatives to GitHub were more popular because it just adds that much more friction for a project to move if they have legitimate reasons to want something else.
I think GitHub is fine, but I'm using something else just because GitHub has so much market presence. I wish more people did the same.