code: def size(self):
          "The canonical serialized size of this branch."
          if getattr(self, '_size', None) is None:
              self._size = getattr(self.node, 'size', 0)
          return self._sizf size(self):
          "The canonical serialized size of this branch."
          if getattr(self, '_size', None) is None:
              self._size = getattr(self.node, 'size', 0)
          return self._size
docs: The canonical serialized size of this branch.