When `x => [x * 2]` is a function that returns an array, but you do not want an array of arrays. Doesn't make much sense with such a lambda, of course. And of

When `x => [x * 2]` is a function that returns an array, but you do not want an array of arrays. Doesn't make much sense with such a lambda, of course. And of course you could call `flatmap` bind, if you prefer ;)