JS also had the major advantage of being sandboxed by design, so they could work from there. Most of the technical legacy centered around syntax backwards compatibility, but it's all isolated - so much easier to optimize.
Python with it's C API basically gives you the keys to the kingdom on a machine code level. Modifying something that has an API to connect to essentially anything is not an easy proposition. Of course, it has the advantage that you can make Python faster by performance analysis and moving the expensive parts to optimized C code, if you have the resources.
Python with it's C API basically gives you the keys to the kingdom on a machine code level. Modifying something that has an API to connect to essentially anything is not an easy proposition. Of course, it has the advantage that you can make Python faster by performance analysis and moving the expensive parts to optimized C code, if you have the resources.