KeyedIterable containing the first
n values of the current
public function take( int $n, ): KeyedIterable<Tk, Tv>;
KeyedIterable will always be a proper subset of the current
$n is 1-based. So the first element is 1, the second 2, etc.
int $n- The last element that will be included in the returned
KeyedIterable<Tk, Tv>- A
KeyedIterable that is a proper subset of the currentKeyedIterable
up ton` elements.