@CheckForNull
  public E lower(E element) {
    int index = headIndex(element, false) - 1;
    return (index == -1) ? null : elements.get(index);
  }

  @Override
  @CheckForNull
  public E floor(E element) {
    int index = headIndex(element, true) - 1;
    return (index == -1) ? null : elements.get(index);
  }

  @Override
  @CheckForNull
  public E ceiling(E element) {

	case isNegInt(x) || IsInf(x, -1) || IsNaN(x):
		return NaN()
	case IsInf(x, 1):
		return Inf(1)
	case x == 0:
		if Signbit(x) {
			return Inf(-1)
		}
		return Inf(1)
	}
	q := Abs(x)
	p := Floor(q)
	if q > 33 {
		if x >= 0 {
			y1, y2 := stirling(x)
			return y1 * y2
		}
		// Note: x is negative but (checked above) not a negative integer,

	sink64[0] = math.Ceil(x)

	// amd64/v2:-".*x86HasSSE41" amd64/v3:-".*x86HasSSE41"
	// amd64:"ROUNDSD\t[$]1"
	// s390x:"FIDBR\t[$]7"
	// arm64:"FRINTMD"
	// ppc64x:"FRIM"
	// wasm:"F64Floor"
	sink64[1] = math.Floor(x)

	// s390x:"FIDBR\t[$]1"
	// arm64:"FRINTAD"
	// ppc64x:"FRIN"
	sink64[2] = math.Round(x)

	// amd64/v2:-".*x86HasSSE41" amd64/v3:-".*x86HasSSE41"
	// amd64:"ROUNDSD\t[$]3"
	// s390x:"FIDBR\t[$]5"

	dst := bufio.NewWriter(w)
	for i := range src {
		for len(boundaries) > 0 && boundaries[0].Offset == i {
			b := boundaries[0]
			if b.Start {
				n := 0
				if b.Count > 0 {
					n = int(math.Floor(b.Norm*9)) + 1
				}
				fmt.Fprintf(dst, `<span class="cov%v" title="%v">`, n, b.Count)
			} else {
				dst.WriteString("</span>")
			}
			boundaries = boundaries[1:]
		}
		switch b := src[i]; b {

 All 2
 Cast 1
 Const 17
 Equal 2
 ExpandDims 2
 GatherV2 1
 Identity 1
 ReverseSequence 1
 Shape 2
 StridedSlice 2
 Transpose 2
cluster 8 size 11
 Cast 1
 Const 4
 Floor 1
 Identity 1
 Mul 2
 Pow 1
 Sub 1
cluster 9 size 5
 All 1
 Const 1
 Less 1
 LogicalAnd 1
 LogicalNot 1
cluster 10 size 9
 All 1
 Const 4
 Equal 1
 LessEqual 1

}

func max(x, y int) int {
	if x < y {
		return y
	}
	return x
}

// roundDown10 rounds a number down to the nearest power of 10.
func roundDown10(n int) int {
	var tens = 0
	// tens = floor(log_10(n))
	for n > 10 {
		n = n / 10
		tens++
	}
	// result = 10^tens
	result := 1
	for i := 0; i < tens; i++ {
		result *= 10
	}
	return result
}

}

// Put adds x to the pool.
func (p *Pool) Put(x any) {
	if x == nil {
		return
	}
	if race.Enabled {
		if runtime_randn(4) == 0 {
			// Randomly drop x on floor.
			return
		}
		race.ReleaseMerge(poolRaceAddr(x))
		race.Disable()
	}
	l, _ := p.pin()
	if l.private == nil {
		l.private = x
	} else {
		l.shared.pushHead(x)
	}
	runtime_procUnpin()

		return fmt.Errorf("broadcaster already stopped")
	default:
	}

	m.incoming <- Event{action, obj}
	return nil
}

// Action distributes the given event among all watchers, or drops it on the floor
// if too many incoming actions are queued up.  Returns true if the action was sent,
// false if dropped.
func (m *Broadcaster) ActionOrDrop(action EventType, obj runtime.Object) (bool, error) {
	m.incomingBlock.Lock()