I think it's all about performance. > Now there is a pretty sound reason for making your code segment read only Sure, but I've had enough situations where abi

I think it's all about performance. > Now there is a pretty sound reason for making your code segment read only Sure, but I've had enough situations where ability to generate code made inner loop 2-3x faster, by removing branches and constant folding. Difficult? Yes! Error prone? Yes! Fast? Hell yes! > It is entirely possible to write a piece of code which is both a core interpreter Yes, but it's going to be 10-100x slower.