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When inline signing is enabled for a zone without creating signing keys for it, changes subsequently applied to the raw zone will not be reflected in the secure zone due to the dns_update_signaturesinc() call inside receive_secure_serial() failing. Given that an inline zone will be served (without any signatures) even with no associated signing keys being present, keep applying raw zone deltas to the secure zone until keys become available in an attempt to follow the principle of least astonishment. (cherry picked from commit 6acf3269) (cherry picked from commit 8a58a607)
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