Array comprehensions with Spread operator

[monolithed]

```js
let x = [0, 1, 2];
let y = [3, 4, 5];


// Expected
[ for (i of [x, y]) ...i ];


// Reality
Array.prototype.concat(...[ for (x of [x, y]) i ]);


// Result
[0, 1, 2, 3, 4, 5]
```

Is there any discussion on this subject?
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