static ItIt<Int> countIterator(int a default 0, int b) {
  ret countIterator_exclusive(a, b);
}



static <A> ItIt<A> countIterator(int a default 0, int b, IF1<Int, A> f) {
  ret countIterator_exclusive(a, b, f);
}

static <A> ItIt<A> countIterator(int a, int b, int step) {
  ret countIterator_exclusive_step(a, b, step);
}