Number.prototype.toFixed() sometimes rounds to non-closest value

I'm using Microsoft Edge 42.17134.1.0.

Following code shows unexpected result with Microsoft Edge.

```
x1 = 0.015;
x2 = 0.045;
console.log(x1.toFixed(2)); // Edge: 0.02, Chrome: 0.01
console.log(x2.toFixed(2)); // Edge: 0.05, Chrome: 0.04
```

ECMAScript specification requires that `Number.prototype.toFixed()` must return mathematically closest decimal expression to `x1` and `x2`. The exact value of `x1` is 0.01499999999999999944... and `x2` is 0.0449999999999999983... , so the return value should be `"0.01"` and `"0.04"`;