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Update named_zone_reusable() so that it does not consider a zone to be eligible for reuse if its old value of the "mirror" option differs from the new one. This causes "rndc reconfig" to create a new zone structure whenever the value of the "mirror" option is changed, which ensures that the previous zone database is not reused and that flags are properly set in responses sourced from zones whose "mirror" setting was changed at runtime.
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