implementation
- Add a system test for mixed-case data for the same owner
- Fixes of CVE-2023-4408
- Prevent assertion failure when nxdomain-redirect is used with
RFC 1918 reverse zones
- Prevent assertion failure if DNS64 and serve-stale is used
- Specific recursive query patterns may lead to an
out-of-memory condition
- Prevent increased CPU consumption in DNSSEC validator
- Add mctx attach/detach when creating/destroying a memory pool
- Define variants to empty values
