ipf.conf vs. ipf6.conf

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

Next question on ipf (the one in NetBSD-6):

Is my impression correct that rules in ipf.conf (i.e. loaded with ipf 
without -6) only apply to IPv4 while rules in ipf6.conf (i.e. loaded 
via ipf -6) apply only to IPv6. Right?

Now, what if rules are added to a non-default group? Are these groups also 
IP version specific or will a packet having matched a "head 100" rule in 
ipf.conf be matched against a "group 100" rule in ipf6.conf?

Is it also correct that non-IP frames (ARP, PPPoE) are never matched by 
IPF rules?