Follow Well in the case of Javascript in particular, isn't that kind of already happening in the form of variable lookups? It's running on a runtime that can enforce code only having access to what's in its environment. (In practice right now you'll almost always have dangerous stuff in your environment, but that doesn't have to be so.)

Re: native code, yeah, you're right. I think that's what wasm nanoprocesses are exploring. Don't know if it'll be fast enough to build an OS on though :)

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