- Bug #3601: Fixed the bug that the refresh URL was not generated correctly by `Captcha` (qiangxue, klevron)
- Bug #3715: Fixed the bug that using a custom pager/sorter with `GridView` may generate two different pagers/sorters if the layout configures two pagers/sorters (qiangxue)
- Bug #3716: `DynamicModel::validateData()` does not call `validate()` if the `$rules` parameter is empty (qiangxue)
- Bug #3752: `QueryBuilder::batchInsert()` does not typecast input values (qiangxue)
- Bug: Fixed inconsistent return of `\yii\console\Application::runAction()` (samdark)
- Bug: URL encoding for the route parameter added to `\yii\web\UrlManager` (klimov-paul)
- Bug: Fixed the bug that requesting protected or private action methods would cause 500 error instead of 404 (qiangxue)