1.3 and 1.2.1 Compatibility

[Stephen Rasku]

We have a central Mercurial server that our build machine pulls from
to make official builds.  This is currently on Hg 1.2.1.  We are
considering upgrading this system to 1.3.  However, all of our
developers will continue to use 1.2.1 until we can upgrade Python on
their individual machines.

My impression is that the Mercurial development team is commited to
maintaining backward compatibility for the repository format.  Is this
correct?  If so, I should have no problems using 1.2.1 on a 1.3
repository.  I understand the subrepos feature won't work on 1.2.1 but
it will allow me to experiment with the feature on the server.  Am I
missing anything?

...Stephen