Feature: Improve promise cancellation for DNS lookup retries and clean up any garbage references. (#118 by @clue)

Fix: Reject parsing malformed DNS response messages such as incomplete DNS response messages, malformed record data or malformed compressed domain name labels. (#115 and #117 by @clue)

Fix: Fix interpretation of TTL as UINT32 with most significant bit unset. (#116 by @clue)

Fix: Fix caching advanced MX/SRV/TXT/SOA structures. (#112 by @clue)