[OpenID] Yahoo doesn't return openid.mode=cancel responses?

[Deron Meranda]

I'm seeing something unexpected with using Yahoo! as an OP.

If, once I get on Yahoo!'s OpenID authorization page I click
"cancel" rather than "continue"; it redirects my browser to the
Yahoo! public home page at http://www.yahoo.com/ -- rather
than going back to the RP's return_to URL with an openid.mode
of "cancel".

Other OP's I'm testing with seem to work as expected; they
return a cancel message back to my RP.

Am I potentially doing something wrong, or is Yahoo! not
following the OpenID spec here?
-- 
Deron Meranda