Uint8Array.from / new Uint8Array does not work on iterables

Instead, it silently returns an empty uint8arr

```js
>> Array.from(new Set([1,2,3]))
[ 1, 2, 3, [length]: 3 ]
>> Uint8Array.from(new Set([1,2,3]))
Uint8Array [  ]
>> new Uint8Array(new Set([1,2,3]))
Uint8Array [  ]
```