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By duplicating the config. Tested on dual-stack and IPV4 only. On v4-only, the v6 probe fails and DDNS does not attempt to update the v6 address, as expected.
Addresses #1735 . Duplicating config is not clean, but appears to work with CloudFlare. This can be changed to "ipv4 and ipv6" if or when ddns-updater gains that functionality.