any known issues downgrading from cvs-1.12?

[Bill Weir]

I'm the admin of a CVS server that's currently at 1.11.17.  I'm 
considering upgrading to 1.12.13, and want to minimise the chances of 
unpleasant surprises.  I've tried a 1.12.13 installation on another 
server, with a snapshot of my repository copied from my main CVS server, 
and didn't find anything too scary.  However, before taking the plunge 
for real, I just want to clarify one point:

Are there any changes in the format of the actual repository files (eg 
"myfile,v") between 1.11 and 1.12?  I'm thinking of a hypothetical (and 
probably unlikely) situation where I upgrade from 1.11 to 1.12, run with 
it for a while, and then for some reason decide to revert to the old 
1.11 setup.  Will cvs-1.11 have any trouble dealing with commits that 
were done with cvs-1.12?

TIA,

--
Bill Weir