fixup! 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 chr(1)
+    return chr(0)

product/CMFActivity/ActivityConnection.py

@@ -34,7 +34,7 @@ from Acquisition import aq_parent
 # If the sort order below doesn't work, we cannot guarantee the sort key
 # used below will actually result in the activity connection being committed
 # after the ZODB and Catalog data.
-assert None < 0 < '' < (), "Cannot guarantee commit of activities comes after the appropriate data"
+assert '' < chr(0) < chr(1) < 'xxx' < chr(255), "Cannot guarantee commit of activities comes after the appropriate data"
 
 manage_addActivityConnectionForm = HTMLFile('dtml/connectionAdd', globals())
 
@@ -66,4 +66,4 @@ InitializeClass(ActivityConnection)
 
 class ActivityDB(DB):
 
-    _sort_key = chr(2)
+    _sort_key = chr(255)

product/ERP5Type/TransactionalVariable.py

@@ -70,7 +70,7 @@ class TransactionalVariable(dict):
   _unregistered = True
 
   def sortKey(self):
-    return chr(0)
+    return ''
 
   commit = tpc_vote = tpc_begin = tpc_abort = lambda self, transaction: None