Comment 7 for bug 143657

Dieter reports that this patch works around a bug in ZODB which causes subitems of an ExtensionClass-based
folder to be loaded whenever the parent is loaded, just to get the class:

  http://groups.google.com/group/plone-users/browse_thread/thread/64df7bde356360c8/49d9390074f6b58c?lnk=raot#msg_a177c1246bb4e5f1