#1 default values

module fx-sys {

  yang-version "1.1";
  namespace "http://test.ru/fx/yang/sys";
  prefix "sys";

  organization "TEST";
  contact "yang@test.ru";
  description "sys root module";

  container sys {
    leaf hostname {
       description "Set router host name";
       default "Cronix";
       type string;
     }
  }

}

$ klish
configure
set sys hostname cronix
commit
show -- here we will see

 sys { 
   hostname Cronix;
 }

Expected behavier: hide items that are in defaults.

I don't understand. You REALLY set the element by "set" command. Default is not a case. It has value set by user and show it.