code: public static SObject of(String key, String content, String... attrs) {
          SObject sobj = of(key, content);
          Map<String, String> map = C.Map(attrs);
          sobj.setAttributes(map);
          return sobj;
      }
docs: Construct an sobject with key, content and attributes specified in sequence
  key1, val1, key2, val2, ...
  
  @see #of(String, String, Map)