- Bug #6940: `yii\web\Response::sendContentAsFile()` may not send correct `content-length` header (sadgnome)
- Bug #6969: `yii\helpers\ArrayHelper::htmlEncode()` and `htmlDecode()` should not remove non-string data (qiangxue)
- Bug #7037: `yii\console\controllers\AssetController` now correctly handles relative image URLs if source and target CSS are under same directory (klimov-paul)
- Bug #7055: composite IN condition was not generated correctly for certain DBMS (nineinchnick)
- Bug #7074: `yii\data\ArrayDataProvider` did not correctly handle the case `Pagination::pageSize = 0` (kirsenn, qiangxue)
- Enh #5663: Added support for using `data-params` to specify additional form data to be submitted via the `data-method` approach (usualdesigner, qiangxue)
- Enh #6106: Added ability to specify `encode` for each item of `yii\widgets\Breadcrumbs` (samdark, aleksanderd)