1. Will proper tail calls only happen in strict mode, and if not are we ok with losing backwards compatibility re. [function].caller and [ callingFunction].arguments?
2. Will tail call behavior apply regardless of the tail call syntax? (fn(), fn.call, fn.apply)? 3. Will tail call behavior apply even when the tail call is not recursive? 4. If function fn has a function call in the tail position and is then bound (fn2 = fn.bind(x)), will fn2 also support proper tail calls? (I think this is only relevant if (3) is true) thanks
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