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--- a/Allura/allura/controllers/base.py
+++ b/Allura/allura/controllers/base.py
@@ -4,4 +4,6 @@
 class BaseController(object):
     @expose()
     def _lookup(self, name, *remainder):
+        """Provide explicit default lookup to avoid dispatching backtracking
+        and possible loops."""
         raise exc.HTTPNotFound, name