code: private int calculateNewCapacity() {
      int oldCapacity = queue.length;
      int newCapacity =
          (oldCapacity < 64) ? (oldCapacity + 1) * 2 : IntMath.checkedMultiply(oldCapacity / 2, 3);
      return capAtMaximumSize(newCapacity, maximumSize);
    }
docs: Returns ~2x the old capacity if small; ~1.5x otherwise.