code: func newNode(cmp common.Comparator, maxLevels uint8) *node {
  	return &node{
  		entry:   cmp,
  		forward: make(nodes, maxLevels),
  		widths:  make(widths, maxLevels),
  	}
  }
docs: // newNode will allocate and return a new node with the entry
  // provided.  maxLevels will determine the length of the forward
  // pointer list associated with this node.