[declan_roberts]

It's a really cool feature but what is a scenario when your average programmer needs such sandboxing?

[myaccountonhn]

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.

[briaoeuidhtns]

you're embedding it as a scripting api and want to limit permissions to just what's needed

[petee]

The TIC-80 game engine embeds Janet, and if i recall sandboxes the games created