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20210223:
    YADIFA 2.4.2-public

    Fixes an issue where records below delegation are not ignored (https://github.com/yadifa/yadifa/issues/12).
    Fixes an issue in the _mm model where shutting down while still initializing may not stop properly.
    Changes default user/group to 'yadifa' user in example configuration.
    Fixes an issue with autoconf 2.70 obsolete functions.
    Fixes an issue where an unknown key configured in a zone acl may lead to a crash.
    Fixes an issue where an query without EDNS involving ACLs using optional keys would incorrectly be rejected.
    Fixes an issue where a network thread with a failed context would incorrectly have its context deleted.
    Adds a feature to yadifad to ensure that the dates in the key-roll section can be successfully applied for the next 10 years (--check-policies).
    Added support for primary and secondary variant options.
    Fixes builds for gcc 11.

