[OpenID] Maximum recommended URI length?

[SitG Admin]

If the spec calls for any legal URI, and there is no theoretical 
length limit (but a practical limit because of what servers will 
allow to get through), how many OpenID servers (OP or RP) "in the 
wild" today would pass compatibility testing? I decided to research 
this matter more, and found one that seems prepared to fail:

http://code.djangoproject.com/wiki/CookBookShortcutsOpenIDAuthentication

I can't be sure because I don't read Python and I'm not even reading 
past that 5th line, but it seems simple enough - the input field for 
URI is 30 characters wide and will accept a maximum of 50 characters.

I found something about a 255-byte limit (or 512, or 1024) for 
proxies, but this seems to be more about URI's in general and less 
about OpenID specifically:

http://www.oreillynet.com/xml/blog/2007/12/question_does_the_uri_length_r.html

And then, finally, I found an earlier thread on this very topic 
between Martin Atkins and Brad Fitzpatrick:

http://lists.danga.com/pipermail/yadis/2005-May/000317.html

I just read through the specs for v2.0 (and then searched for '50' 
and '255' to make sure I hadn't missed anything), but the only 
mention of either is for 'assoc_handle' and 'openid.response_nonce'. 
I went back to v1.0 and checked, discovering that there *was* mention 
under "Appendix D. Limits":

http://openid.net/specs/openid-authentication-1_1.html#limits

Is there some reason this section was removed under v2.0?

-Shade