String and Array share a few methods.
I think `repeat` could exist for Array as well
At the moment are other more verbose ways to do so:
- `Array.from({length: n}, () => 'foo')`
- `Array(n).fill('foo')`
- `[].concat(...Array.from({length: 3}, () => ['x', 'y']))`
- `[].concat(...Array(3).fill(['x', 'y']))`
so with repeat it would just be;
- `['foo'].repeat(n)`
- `['x', 'y'].repeat(3)`
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