[zombiezen]

Not yet, but I've hacked up most of the Linux sandboxing: https://github.com/256lights/zb/issues/29

I want to introduce Windows sandboxing, too, but I'm not as confident about how to do that: https://github.com/256lights/zb/issues/31

[zombiezen]

Oh and as for Starlark, I went into more detail over in this thread: https://news.ycombinator.com/item?id=41596426