If it doesn’t ever execute Ruby: it cannot be compatible with Homebrew. “Compatible” is doing a bit of work here when it also means “implicitly relies on Homebrew’s CDN, CI, packaging infrastructure and maintainers who keep all this running”.

There’s a new vibe coded Homebrew frontend with partial compatibility and improved speed every few weeks.

Homebrew is working on an official Rust frontend that will actually have full compatibility. Hopefully this will help share effort across the wider ecosystem.