multiple stories with same post URL break expanded view

[GoogleCodeExporter]

"I have found the problem: the Quipsologies blog has the same post URL for
each post (this should not be the case---it's an improper use of RSS). 
This means that we have no way of discerning one post from another.  We
have some ideas of how to get around this, but for the moment, we have
noted the bug and will figure out how to fix the issue.  Thanks again for
helping us find bugs!"

"The bug you identified only occurs when Google Reader is in expanded mode
on the Quipsologies blog.  If you switch into list view for that blog, the
bug won't show up.  When reading entries in Quipsologies, in the top-right
corner of your screen you will see "Show: Expanded - List."  Click on
"List," and the bug will go away.  When you read other blogs, it appears
that you prefer to browse in Expanded view, so make sure to click back to
"Expanded" for other blogs."

http://wmf.editthispage.com/xml/rss.xml also has this problem

Original issue reported on code.google.com by [email protected] on 27 Aug 2009 at 7:17