token value {
      <val=object> | <val=string> | <val=number> 
    | true    | false     | null 
   }
   # ...
   given ~$/ {
       when "true"  {make Bool::True;}
       when "false" {make Bool::False;}
       when "null"  {make Any;}
       default { make $<val>.made; }
   }