static int[] intRangesToIntArray_startAndLength(Cl<IntRange> l) {
  int n = l(l);
  int[] array = new[n*2];
  int i = 0;
  fOr (IntRange r : l) {
    array[i++] = r.start;
    array[i++] = r.length();
  }
  ret array;
}