I've always wondered about how versioning could help. i don't think it would work with a monolithic kernel, but a microkernel might allow you to run multiple ve

I've always wondered about how versioning could help. i don't think it would work with a monolithic kernel, but a microkernel might allow you to run multiple versions of different things, and they would still work. I've also fantasised about the same thing in application programming languages - e.g. the way racket runs loads of different dialects, you could also have versioning for different things running at the same time.