I'd say that the config item is nice, but it should probably default to 'yes' according to the principle of least surprise. Otoh, if you can figure out that it's an upgrade, then yes, conditionally defaulting to yes sounds best.
-- .''`. martin f. krafft <madd...@d.o> Related projects: : :' : proud Debian developer http://debiansystem.info `. `'` http://people.debian.org/~madduck http://vcs-pkg.org `- Debian - when you have better things to do than fixing systems
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