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b0b898c235
To allow pre-checks to test both IPv6 and IPv4, we must change the default value of edge-ip-version's from 4 to auto. This will allows the tunnel (and pre-check) to probe both IPv4 and IPv6 addresses by default, respecting the system's DNS preference. Instead of always preferring IPv4, cloudflared will now use whichever address family the system resolver returns first.