forwarding rfc1918 queries, stub zones

Maybe a FAQ, but what's the simplest way (if you have a split
caching-only / authoritative setup) to forward queries for rfc1918
reverse lookups to the authoritative machine? Can I just setup a stub
zone for 10.in-addr.arpa. and forward all those queries to the
authoritative nameservers (even if the zones we're running are actually
more specific)?

Also, what should the "master" of a stub zone be set to - the server
it's forwarding queries to?

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