[dns-operations] Looking for zones using white lies (RFC 4470)

[Paul Ebersman]

shuque> The UltraDNS implementation doesn't use the more precise white
shuque> lies epsilon function defined in the spec, but it is probably
shuque> good enough for all practical purposes.

shuque> And it's much closer to white lies than "black" lies, because it
shuque> preserves the correct semantics of NXDOMAIN.

That's actually a pretty good summary already. Basically a "loose" white
lies that was computationally less intensive while trying to be as close
to the RFC as was practical.