@slightlylate *ES spec question: pls forward to the right person if not you!*
According to the spec, what should [...Array(3)] evaluate to?
Node + browsers return [undefined, undefined, undefined], but @typescriptlang compiles to Array(3).slice(), i.e. [ <3 empty items> ]
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Except `Array(3).forEach(fn)` calls fn zero times, where as `[undefined, undefined, undefined].forEach(fn)` calls it 3 times.
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& Web Standards TL; Blink API OWNER
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