No config files are present on the systems. But to my surprise: despite having an `rustup update` on both machines and having the same toolchain versions on both, the actual version of `rustfmt` differs.
```
$ uname
Linux
$ rustfmt --version
rustfmt 1.6.0-stable (79e9716 2023-11-13)
```
```
$ uname
Darwin
$ rustfmt --version
rustfmt 1.6.0-stable (79e9716c 2023-11-13)
```