Also `go fmt` and `dart format`.

> They are mimicking Rust's cargo

Cargo cargo cult?

It's not a cargo cult if it actually works.

Doesn't cargo just have a subcommand plugin system? Or is fmt actually hard-coded into the cargo code?

I prefer the plugin system. I don't like god programs like what the npm monstrosity became.

cargo has an external subcommand system, but it also has "blessed" (my word choice) external subcommands that are typically bootstrapped via Rust toolchain components. This makes them pretty analogous to what uv does here with `uv format`, in my opinion.