So, many dynamic languages have a C API that allows you to write methods in C, and for those methods to do things to objects of the higher level language. This

So, many dynamic languages have a C API that allows you to write methods in C, and for those methods to do things to objects of the higher level language. This is normally a big optimisation boundary because you have to assume any value could have been altered during a C call. However if you run your C extensions through the same framework as you implement your hogh level language then you can remove that optimisation boundary entirely.