if edgeCount < g.destinationEdgeThreshold {
		delete(g.destinationEdgeIndex, n.ID())
		return
	}

	// get or create the index
	index := g.destinationEdgeIndex[n.ID()]
	if index == nil {
		index = newIntSet()
	} else {
		index.reset()
	}

	// populate the index
	g.graph.VisitFrom(n, func(dest graph.Node) bool {
		if destinationEdge, ok := g.graph.EdgeBetween(n, dest).(*destinationEdge); ok {