docs: def remove(self, key):
          """Remove the first key-value pair with key *key*.
  
          If the key was not found, a ``KeyError`` is raised.
          """
          self._find_lt(key)
          node = self._path[0][2]
          if node is self._tail or key < node[0]:
              raise KeyError('{!r} is not in list'.format(key))
          self._remove(node)