JITs work based on assumptions that types/values will stay constant. So, here it probably assumes that it will always be working with integers. So it will be mu

JITs work based on assumptions that types/values will stay constant. So, here it probably assumes that it will always be working with integers. So it will be much more efficient in cases like this as it is pretty much pure, simple computation. At worst there could be one deoptimisation when it moves from 32-bit to 64-bit integers, if v8 uses 32-bit integers first. So it can emit extremely efficient instructions based on this assumption, while CPython struggles along with infinite precision numbers. Function calls will have a much lower overhead also since it will just be a single `call` instruction.