code: func newPathTree(caseSensitive bool, capacity int) *pathTree {
  	return &pathTree{
  		caseSensitive: caseSensitive,
  		nodes:         stringset.New(capacity / 5), // educated guess
  		leafs:         stringset.New(capacity),     // exact
  	}
  }
docs: // newPathTree initializes the path tree, allocating the given capacity.