docs: def by_name(self, name):
          """
          In many cases you want to access directory not by it's ID, but by
          it's name. This method implements red-black search method, which
          internally uses CFB format. Also this method has internal name cache
          to speed up 2nd+ named accesses.
          """
          if name in self._name_cache:
              return self[self._name_cache[name]]
  
          if self.source.root.name == name:
              return self.source.root
          current = self.source.root.child
  
          while current:
              if len(current.name) < len(name):
                  current = current.right
              elif len(current.name) > len(name):
                  current = current.left
              elif current.name < name:
                  current = current.right
              elif current.name > name:
                  current = current.left
              else:
                  return current
  
          raise KeyError(name)