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>Therefore, sandbox is safe as long as functions
>that I put into it's env. are safe. This is probably not a problem,
>since I know what functions are in that env.

Sure, that's by definition of sandbox, right? You *give* your *chosen*
execution environment. In your example, if you don't trust cheat, don't
add it to the environment.

>Still, it'd be nice to be able to restrict env. of the functions like

In your example, I guess the best that could be done would be
to setfenv(g,B) for all Lua functions g in B. This can be done
automatically in a for loop in sandbox. Is this what you meant?