That's why I never want to work in CPython core. The 2 jit PEP's were totally fine, the implementation solid and stable, and even easy to understand for the SC manager types (unlike all other JITs which are much more convoluted), the future impact promising (already faster than Luajit in the Lua port). But then they got on their power trips. profiling frames? Jit templates are jit templates for micro ops, what's not to understand? The very same architecture and ops they use in core already.

As we see over and over again in python core development. It's the worst.