static <A> A popLast(L<A> l) {
  ret liftLast(l);
}

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

ifclass DoubleBuffer
static Double popLast(DoubleBuffer l) {
  ret l == null || l.isEmpty() ? null : l.popLast();
}
endif