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From: Strake <strake888@gmail.com>
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Subject: Re: IPv4 and IPv6 addresses in resolv.conf
Date: Fri, 29 Nov 2013 22:45:26 -0500
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On 29/11/2013, Rich Felker <dalias@aerifal.cx> wrote:
> But that would mean complete unconditional DNS failure on systems
> lacking IPv6.

We could do so iff system has IPv6. Switching on whether system has
IPv6 rather than whether resolv.conf has any IPv6 nameservers means
* no check whether resolv.conf includes v6 server
* that adding a v6 server to resolv.conf can not break DNS even on
systems lacking v6
which seems saner.