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They explicitly do that in ES6:

Right, but implementation hadn't caught up to spec since I last checked.

It's natively supported in typescript and iojs, and babel (prev. 6to5) + other libs enable it in browsers.

I believe the arguments should not be available in arrow functions according to the spec. (source: discussion here https://github.com/Microsoft/TypeScript/issues/1609)

Good question, I wonder that too.

I'm kinda tired of var that = this.

That's why!