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Draft: filter-a plugin to omit some A records in IPv6 environments

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Closed treysis requested to merge treysis/bind9:v9_16_filter-a into main Mar 04, 2021
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I reversed the functionality of the 'filter-aaaa' plugin to omit A records instead of AAAA records.

This is useful especially in some IPv6-only environments. Sometimes, client software ignores system preferences and choses A over AAAA (e.g. 'NodeJS' does or used to do this). On an IPv6-only system, this will result in a failed connection attempt. If no 'happy eyeballs' is used, this will at least defer connection till after timeout, or worse it will make the connection impossible.

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Source branch: v9_16_filter-a