pf, altq and interface groups

[Daniel Melameth]

I've considered migrating my macro-based interface names to interface
groups, but, it appears, altq does not grok interface groups--and pfctl
spits back a pfctl: SIOCGIFMTU: Device not configured when I try.  Am I
missing something here?  pf.conf's BNF, it appears, says I'm not...