anchor.diff:          (assertMinimum "IPv6HopLimit" 0)
           (assertValueOneOf "IPv4ProxyARP" boolValues)
           (assertValueOneOf "IPv6ProxyNDP" boolValues)
  -        (assertValueOneOf "IPv6PrefixDelegation" ["static" "dhcpv6" "yes" "false"])
  +        (assertValueOneOf "IPv6SendRA" boolValues)
           (assertValueOneOf "DHCPv6PrefixDelegation" boolValues)
           (assertByteFormat "IPv6MTUBytes")
           (assertValueOneOf "ActiveSlave" boolValues)
  
positive.code:         (assertValueOneOf "EmitTimezone" boolValues)
        ];
  
        sectionIPv6PrefixDelegation = checkUnitConfig "IPv6PrefixDelegation" [
          (assertOnlyFields [
            "Managed"
            "OtherInformation"
  
negative.code:           [DHCPServer]
            ${attrsToSection def.dhcpServerConfig}
          ''
          + optionalString (def.ipv6SendRAConfig != { }) ''
            [IPv6SendRA]
            ${attrsToSection def.ipv6SendRAConfig}
          ''
          + flip concatMapStrings def.ipv6Prefixes (x: ''
            [IPv6Prefix]
  