cache.clear('name'): minor issue around warnings
> cache.clear('comcast.net')
[round] => 1
[count] => 24
[not_apex] => to clear proofs of non-existence call cache.clear('comcast.net.')
[subtree] => comcast.net.
> cache.clear('comcast.net')
[round] => 1
[count] => 24
[not_apex] => to clear proofs of non-existence call cache.clear('comcast.net.')
[subtree] => comcast.net.