[pjmlp]

I remember reading some articles that justified DLR as CIL not having enough semantics that allowed to properly implement optimization algorithms commonly used in dynamic languages, like method lookup and call site caches.

Then again, maybe I understood it wrongly back then and I surely don't have the knowledge of your team.

[int_19h]

Yes, that's right. But it's kinda what I meant. CIL is really roughly the level of C, plus some strongly typed object oriented stuff on top. It doesn't really offer anything useful for a dynamic language directly. But you can use it to implement a dynamic language VM with all those optimizations - just like C was used to write Parrot VM. DLR is to CLR as Parrot is to native code.