Thats what I was thinking too. I would like to simply see Ruby/Python compile into JS instead. It has been done actually (not sure about Ruby) - don't know how well it performs though.
GorillaScript is designed to run with JavaScript semantics and be as efficient as possible (within reason), so that when you write something as simple as `x + y` in GorillaScript, it is efficient, even with unknown types, unlike Python which would need to check `__add__` or Ruby with its operators-as-methods system.
Also, since JavaScript is so different from so many languages with async-by-default, handle through callbacks or promises or something, being able to replicate something as compilicated as Python's GIL in JavaScript would be atrocious as compared to designing your code in a language that nudges you to write "good" JavaScript.