docs: function (item, options, serializerInstance) {
                  if (serializerInstance) {
                      if ("serialize" in serializerInstance) {
                          return serializerInstance.serialize(item, options);
                      } else {
                          this.$logError(this.INVALID_JSON_SERIALIZER_INSTANCE);
                          return null;
                      }
                  }
  
                  return this.__defaultJsonSerializer.serialize(item, options);
              }