Your filesystem and OS has absolutely different constraints, they don’t modify their objects to such a degree as most programs modify memory. So honestly, you s

Your filesystem and OS has absolutely different constraints, they don’t modify their objects to such a degree as most programs modify memory. So honestly, you should provide more evidence why would that work (for a low-level, systems programming language). And don’t get me wrong, FP languages en large can be very competitive with a more imperative approach, especially when multithreading is on the table, but they achieve it through extensive compile time transformations, and on the data structure level by much smarter algorithms than plain COW.