range() should have been registered as a Sequence.
Needs to be backported to 2.6, 2.7, and 3.0.
diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index eed8762..c7636ec 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -546,6 +546,7 @@
 
 Sequence.register(tuple)
 Sequence.register(str)
+Sequence.register(range)
 
 
 class ByteString(Sequence):