he/him 
For kicks, I tried out some BabelJS ES6 features also(-ish) in CoffeeScript. It can be nice not to follow a spec ;) http://i.imgur.com/HwlNwuh.png
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@amasad@jashkenas Those two are the only things that I know of that are actually slow since they have a lot of spec complexity.
@amasad @jashkenas CoffeeScript can be much more liberal with it's implementation but once ES6 is mainstream CS won't be "just JavaScript".
