zope4: sortKey should be str in transaction 1.4.1 or later.

product/CMFActivity/ActivityBuffer.py

@@ -76,4 +76,4 @@ class ActivityBuffer(TM):
 
   def sortKey(self, *ignored):
     """Activities must be finished before databases commit transactions."""
-    return -1
+    return chr(1)

product/CMFActivity/ActivityConnection.py

@@ -66,4 +66,4 @@ InitializeClass(ActivityConnection)
 
 class ActivityDB(DB):
 
-    _sort_key = (0,)
+    _sort_key = chr(2)

product/ERP5Type/TransactionalVariable.py

@@ -70,7 +70,7 @@ class TransactionalVariable(dict):
   _unregistered = True
 
   def sortKey(self):
-    return None
+    return chr(0)
 
   commit = tpc_vote = tpc_begin = tpc_abort = lambda self, transaction: None
 
@@ -127,7 +127,7 @@ class TransactionalResource(object):
     return not (args in tv or tv.add(args))
 
   def sortKey(self):
-    return 1
+    return chr(1)
 
   abort = commit = tpc_vote = tpc_begin = tpc_finish = tpc_abort = \
     lambda self, transaction: None