}

		if len(left) == 0 {
			return buildHuffmanNode(t, right, level+1)
		}
		return buildHuffmanNode(t, left, level+1)
	}

	nodeIndex = uint16(t.nextNode)
	node := &t.nodes[t.nextNode]
	t.nextNode++

	if len(left) == 1 {
		// leaf node
		node.left = invalidNodeValue
		node.leftValue = left[0].value
	} else {
		node.left, err = buildHuffmanNode(t, left, level+1)
	}

	if err != nil {