> On a similar note, you probably couldn't protect against:
> Array.foo = whatever;
> i suspect that the only safe way to do it is recreate the whole sandbox 
on each run. Not doing so will eventually lead to weird behaviours, i 
think (via sneaky modifications like custom properties on built-ins).
We actually want those sneaky mods to stick within a given "session".  
Changes to build-ins are ok so long as there is no way to cross contaminate 
another "session" (with is own set of built-ins)

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