ActiveField::radioList() 方法不能设置验证规则为必填吗？ [ 2.0 版本 ]

// 视图代码:
<?= $form->field($model, 'is_reply')->radioList($statusList, ['class' => 'form-radio-inline']) ?>

// 渲染的HTML代码:
<div class="form-group field-feedback-is_reply required">
    <label class="control-label form-label">已回复</label>
    <div class="form-input">
        <input type="hidden" name="Feedback[is_reply]" value="">
        <div id="feedback-is_reply" class="form-radio-inline" role="radiogroup" aria-required="true" aria-invalid="true">
            <label><input type="radio" name="Feedback[is_reply]" value="0"> 未回复</label>
            <label><input type="radio" name="Feedback[is_reply]" value="1"> 已回复</label>
        </div>
        <div class="help-block"></div>
    </div>
</div>

// 验证规则:
[['is_reply'], 'required']],

结果只要值发生改变，就会提示必填：