This goes the other direction too. I just this second fixed a problem with incredibly slow SSH connections because a host lookup which returned an IPv4 address instantly was waiting 10+ seconds for an IPv6 response which would never come.

Now I'm sure I can fix DNSmasq to do something sensible here, but the defaults didn't even break - they worked in the most annoying way possible where had I just disabled IPv6 that would've fixed the entire problem right away.

Dual stack has some incredibly stupid defaults.