Finally managed to find a workaround for the #RustLang problem I was having with `cargo publish` picking up files from my gitignore-d `.direnv` directory and complaining about them being uncommitted.

This was the result of cascading surprises: setting `package.includes` causes gitignore to no longer be considered, and `"README.md"` in `package.includes` actually works like `"**/README.md"`' and picks up the READMEs from the repositories in `.direnv/flake-inputs/`.

github.com/rust-lang/cargo/iss