Echo JS 0.11.0

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ts comments

ts 242 days ago. link 3 points
Notice that `x === void 0` is not always as same as `typeof x === 'undefined'` in browser context:

console.log(document.all === void 0); // false
console.log(document.all === null); // false
console.log(document.all == void 0); // true
console.log(typeof document.all); // 'undefined'

But it does not mean anyone of them is incorrect, since there is no defined behavior for such a monster thing in ECMAScript.