It might be useful to have a list of all features that should not be
used on a master with downlevel slaves.  Here's a few that I know of:

 - newer enctypes (AES was added in... 1.4 and since then Camellia is
the newest) for service keys, particularly krbtgt keys
 - multiple MKVNOs (I forget when this was added)
 - n-strikes user principal locking (IIRC that was in 1.8)
 - extended policies (1.11)

There are probably others.  I'm guessing PKINIT is a feature you don't
want to use in a master with downlevel slaves.
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