In June 2006 i reported a bug in zope catalog that seems to be well known across the plone community, but nobody seems to care about:

the catalog calls subobjects named like indexable attributes which mostly leads to strange errors.
if you try to add a document with the id ’start’ to your plone site for example, you’ll get a Syntax Error (because DateIndex tries to create a DateTime object out of the document’s html representation.

The first response on my issue was that this is how the catalog works and that it won’t be fixed.
I tried to argument for fixing this problem again and would be happy to have people interested in this joining the discussion.