public function take( int $n, ): ImmVector<Tv>;
ImmVector will always be a subset (but not necessarily a
proper subset) of the current
$n is greater than the
length of the current
ImmVector, the returned
ImmVector will contain
all elements 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
Vector::take](</hack/reference/class/Vector/take/#examples>) for usage examples.