1ebff74c21
The cache lookup was performed before rule matching, using the caller's strategy (usually AsIS/0) instead of the resolved strategy. This caused cache misses when ipv4_only was configured globally but the cache lookup expected both A and AAAA records. Remove LookupCache and ExchangeCache from Router, as the cache checks inside client.Lookup and client.Exchange already handle caching correctly after rule matching with the proper strategy and transport.
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