Scary but also cool
But even then you’ll have users putting things in the same compartment for convenience, rather than leaving them properly sequestered.
This is a good point; however the isolating code should be much smaller and easier to verify.
[1] https://news.ycombinator.com/item?id=47273854
[2] https://news.ycombinator.com/item?id=47611921
Scary but also cool