static Range intersectRanges(Range a, Range b) {
  float min = max(a.min, b.min);
  float max = min(a.max, b.max);
  ret min <= max ? new Range(min, max) : null;
}

static DoubleRange intersectRanges(DoubleRange a, DoubleRange b) {
  ret intersectDoubleRanges(a, b);
}