- In previous releases, the ``repoze.bfg.url.model_url``,

  ``repoze.bfg.traversal.model_path`` and
  ``repoze.bfg.traversal.model_path_tuple`` functions always ignored
  the ``__name__`` argument of the root object in a model graph (
  effectively replacing it with a leading ``/`` in the returned value)
  when a path or URL was generated.  The code required to perform this
  operation was not efficient.  As of this release, the root object in
  a model graph *must* have a ``__name__`` attribute that is either
  ``None`` or the empty string (``''``) for URLs and paths to be
  generated properly from these APIs.  If your root model object has a
  ``__name__`` argument that is not one of these values, you will need
  to change your code for URLs and paths to be generated properly.  If
  your model graph has a root node with a string ``__name__`` that is
  not null, the value of ``__name__`` will be prepended to every path
  and URL generated.

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