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Vladimír Čunát authored
Iterating over sibling sub-queries isn't precise enough, and in particular in forwarding mode it reported non-existing loops. Example ATM: www.dpo.cz - there forwarding spawns multiple sub-queries, and one of those is a CNAME to another of them. Due to them being siblings, the old code misdetected that as a CNAME loop. Now that we have these cname_parent pointers, we can do a precise detection.
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