message: Fixed - undefined / null / NaN defaults are equal to 0.0
diff: @@ -70,7 +70,7 @@ export class SurveyQuestionRadiogroup extends SurveyQuestionElementBase {
  item={item}
  textStyle={this.textStyle}
  index={index}
  - isChecked={this.state.value == item.value}
  + isChecked={this.state.value === item.value}
  />
  );
  }
  