n-ary curry in CoffeeScript

I was playing with CoffeeScript when I found myself writing the following lines and then looking at them in awe:

Are any Javascript engines tail call optimized?

I have a tail recursive pathfinding algorithm that I've implemented in Javascript and would like to know if any (all?) browsers would possibly get stack overflow exceptions.

How can I transition from Java to Clojure?

After discovering Clojure I have spent the last few days immersed in it.