anchor.diff:            "DUIDType"
             "DUIDRawData"
             "IAID"
  +          "UseDelegatedPrefix"
           ])
           (assertValueOneOf "UseAddress" boolValues)
           (assertValueOneOf "UseDNS" boolValues)
  
positive.code:           "BlackList"
            "RequestOptions"
            "SendOption"
          ])
          (assertValueOneOf "UseDNS" boolValues)
          (assertValueOneOf "RoutesToDNS" boolValues)
  
negative.code:         (assertValueOneOf "UseAutonomousPrefix" boolValues)
          (assertValueOneOf "UseOnLinkPrefix" boolValues)
          (assertValueOneOf "DHCPv6Client" (boolValues ++ ["always"]))
          (assertValueOneOf "UseMTU" boolValues)
          (assertValueOneOf "UseGateway" boolValues)
          (assertValueOneOf "UseRoutePrefix" boolValues)
        ];
  
        sectionDHCPServer = checkUnitConfig "DHCPServer" [
  