CLOUDFLAREAPI: Reduce confusion by making CF_CNAME_FLATTEN_ON and CF_PROXY_ON mutually exclusive #4026
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Cloudflare API silently ignores/discards the CNAME flattening setting when proxy is enabled, which leads to confusing behavior and drift.
Even worse, the CNAME flattening setting isn't set, so dnscontrol continuously sees drift and tries to re-apply the setting.
Per DNSControl Opinion 6 ("if it is ambiguous in DNS, it is forbidden in DNSControl"), we now reject configurations that set both modifiers on the same record.