By "it" I meant this part from TFA: > you should write a native extension with a very very limited API where most work is done in Ruby. Any native code would b

By "it" I meant this part from TFA: > you should write a native extension with a very very limited API where most work is done in Ruby. Any native code would be a very thin wrapper around the function we actually want to call that just converts Ruby types in to the types required by the native function. I think our main disagreement is your assertion that any compilation at runtime qualifiees as JIT. I consider JIT to be dynamic compilation (and possibly recompilation) of a running program, not merely anything that generates machine code at runtime.