[jashmatthews]

We need all those complex features with tracing JITs too. Getting into a trace is basically OSR. Exiting a trace and restoring the interpreter state is basically an OSR exit or deoptimization. It's really just different terminology for the same thing. Inline caches on method calls become guards. We can't just ignore them.

LuaJIT does without hidden classes or property caching because on-trace it's able to eliminate table access and allocation. Performance tanks on OO Lua once you fall off trace. You can work around it with "compile another trace" in a sense that works as long as you have infinite cache.