- Enh #10545:`yii\web\XMLResponseFormatter` changed to format models in a proper way (andrewnester)
- Enh #10783: Added migration and unit-tests for `yii\i18n\DbMessageSource` (silverfire)
- Enh #10797: Cleaned up requirements checker CSS (muhammadcahya)
- Enh #11336: Allow resettting `$hostInfo`, `$scriptUrl`, and `$pathInfo` in `yii\web\Request` to `null`, to make Yii determine the value again (cebe)
- Enh: Added last resort measure for `FileHelper::removeDirectory()` fail to unlink symlinks under Windows (samdark)
- Enh: `AttributeBehavior::getValue()` now respects the callable in array format (silverfire)
- Chg #6419: Added `yii\web\ErrorHandler::displayVars` make list of displayed vars customizable. `$_ENV` and `$_SERVER` are not displayed by default anymore (silverfire)