Rudder

On Rudder 6.2, maybe in previous versions as well
I was expecting an error

[root@server ~]# curl -k -X POST -H "X-API-TOKEN: $(cat /var/rudder/run/api-token)" 'http://localhost:8080/rudder/api/latest/settings' -d 'unexpected_unbound_var_values=sfg'  
{"action":"modifySettings","result":"success","data":{"settings":{}}}

 curl -k -X POST -H "X-API-TOKEN: $(cat /var/rudder/run/api-token)" 'http://localhost:8080/rudder/api/latest/settings' -d 'rudder_generation_delay=0DF'  
{"action":"modifySettings","result":"success","data":{"settings":{}}}