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It's a really cool feature but what is a scenario when your average programmer needs such sandboxing?
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I sandbox all my utilities and programs in case some compromised third-party dependency decides to run lose. It's a way to limit the blast radius.
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you're embedding it as a scripting api and want to limit permissions to just what's needed
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The TIC-80 game engine embeds Janet, and if i recall sandboxes the games created
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