[nine_k]

Quite jolly! I hope that performance impact is negligible.

Now it would be nice to make a wrapper to convert exception-throwing calls into Either-returning calls (or it's there and I missed it?). This would help with accessing standard / third-party libraries.

[r-cyr]

I will try to profile it soon but basically, until now, it was more about "what's possible" than "how fast can I make it" kind of project. Also, that exception-handling either is a great idea, thank you.