var REG = NewRegistrar("Third-Party", "NONE");
var CF = NewDnsProvider("Cloudflare", "CLOUDFLAREAPI");

D("foo.com!external", REG, DnsProvider(CF),
    A("@", "1.2.3.4"),
);

D("foo.com!internal", REG, DnsProvider(CF),
    INCLUDE("foo.com!external"),
    A("local", "127.0.0.1"),
);