docs: def remove(self, node):
          """Remove a node from the list.
  
          The *node* argument must be a node that was previously inserted in the
          list
          """
          if node is None or node._prev == -1:
              return
          if node._next is None:
              self._last = node._prev  # last node
          else:
              node._next._prev = node._prev
          if node._prev is None:
              self._first = node._next  # first node
          else:
              node._prev._next = node._next
          node._prev = node._next = -1
          self._size -= 1