static ItIt<Int> countIterator_inclusive(final int a, final int b) {
  ret countIterator_exclusive(a, b+1);
}

static <A> ItIt<A> countIterator_inclusive(int a, int b, int step default 1, IF1<Int, A> f) {
  ret countIterator_inclusive_step(a, b, 1, f);
}

static <A> ItIt<A> countIterator_inclusive(double a, double b, double step, IF1<Double, A> f) {
  ret countIterator_inclusive_step(a, b, step, f);
}