It is not possible to bind only IPv4 or only IPv6

What happened: When trying to bind IPv4 interfaces only

. {
  bind 0.0.0.0
}

The coredns start listening also on ipv6 interfaces.

What you expected to happen: When 0.0.0.0 is used, it should listen on IPv4 only. The same with :: (IPv6 only). If possible it should be also possible to have corefile like this:

. {
	bind 0.0.0.0
}

. {
	bind ::
}

And the coredns starts...Currently it is not possible as:

maxprocs: Leaving GOMAXPROCS=8: CPU quota undefined
Listen: listen tcp 0.0.0.0:53: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.

How to reproduce it (as minimally and precisely as possible): Both of this:

. {
	bind 0.0.0.0
}

Or:

. {
	bind ::
}

Listens on IPv6 and IPv4: netstat -ano | findstr :53

TCP    0.0.0.0:53             0.0.0.0:0              LISTENING       14536
TCP    [::]:53                [::]:0                 LISTENING       14536
UDP    0.0.0.0:53             *:*                                    14536
UDP    [::]:53                *:*                                    14536

Environment:

• the version of CoreDNS: CoreDNS-1.12.0
• OS: Windows 11 22H2

Feel free to rejected if it is not planned to fix it or if it's intended behavior.