static <A> L<A> takeFirst_lazy(L<A> l, int n) {
  ret l(l) <= n ? l : subList(l, 0, n);
}

static <A> L<A> takeFirst_lazy(int n, L<A> l) {
  ret takeFirst_lazy(l, n);
}

static <A> L<A> takeFirst_lazy(int n, Iterable<A> i) {
  ret takeFirst(n, i);
}