Looks great, Nix-with-Lua that also supports Windows would be amazing. Two questions if I may

- Does this sandbox builds the way flakes do?

- What is MinGW used for on Windows? Does this rely on the MinGW userland, or is it just because it would be painful to write a full bootstrap for a windows compiler while also developing Zb?

Also, its great to see the live-bootstrap in there. I love the purity of how Guix's packages are built, and I like the idea Zb will be that way from the start