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