break
		}
		heap[i] = heap[p]
		i = p
	}
	if heap[i].timer != tw.timer {
		heap[i] = tw
	}
}

// siftDown puts the timer at position i in the right place
// in the heap by moving it down toward the bottom of the heap.
func (ts *timers) siftDown(i int) {
	heap := ts.heap
	n := len(heap)
	if i >= n {
		badTimer()
	}
	if i*timerHeapN+1 >= n {
		return
	}