Protocol V3 question

Tom,

I have started working on the new protocol and have a question.  Since 
the startup packet now lets you set GUC parameters, what happens if you 
send an invalid GUC parameter?  (I don't have anything working yet so I 
can't test this for myself).  The reason I am asking is that the names 
of GUC parameters can change between releases of the server.  So in 7.5 
the 'datestyle' parameter might be renamed to 'dateformat' (unlikely but 
possible).  At the time the startup packet is issued I don't yet know 
what version of the server I am talking to, so I don't know what 
parameter names to use.  Therefore I think the result of passing a 
unknown parameter name should not be fatal.  Also it might be useful to 
know what parameters got set and which did not (although once one knows 
the server version, this probably can be infered from the server 
version).  It would probably be worth a note or two in the protocol docs 
explaining how this will work across server releases so that all client 
implementors are aware of this issue.

thanks,
--Barry