Added XXX about save()'s special-casing of tuples -- I don't get it.
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 1f551d6..2805dfb 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -255,6 +255,7 @@
 
         t = type(object)
 
+        # XXX Why are tuples a special case here?
         if (t is TupleType) and (len(object) == 0):
             if self.bin:
                 self.save_empty_tuple(object)