- Bug #17119: Fix `yii\caching\Cache::multiSet()` to use `yii\caching\Cache::$defaultDuration` when no duration is passed (OscarBarrett)
- Bug #18646: Remove stale identity data from session if `IdentityInterface::findIdentity()` returns `null` (mikehaertl)
- Bug #18660: Fix database migration template does not work with namespaced migrations when migration name does not include namespace (iridance)
- Enh #13105: Add yiiActiveForm `validate_only` property for skipping form auto-submission (ptolomaues)
- Enh #18967: Use proper attribute names for tabular data in `yii\widgets\ActiveField::addAriaAttributes()` (AnkIF)
- Bug #18798: Fix `StringHelper::dirname()` when passing string with a trailing slash (perlexed)
- Enh #18328: Raise warning when trying to register a file after `View::endPage()` has been called (perlexed)
- Enh #18812: Add error messages and optimize "error" methods in `yii\helpers\BaseJson` (WinterSilence, samdark)
- Chg #18823: Rollback changes from #18806 in `yii\validators\ExistValidator::checkTargetRelationExistence()` (WinterSilence)
- Enh #18826: Add ability to turn the sorting off for a clicked column in GridView with multisort (ditibal)
- Bug #18646: Remove stale identity data from session if `IdentityInterface::findIdentity()` returns `null` (mikehaertl)
- Bug #18832: Fix `Inflector::camel2words()` adding extra spaces (brandonkelly)
- Enh #18762: Add `yii\helpers\Json::$keepObjectType` and `yii\web\JsonResponseFormatter::$keepObjectType` in order to avoid changing zero-indexed objects to array in `yii\helpers\Json::encode()` (zebraf1)
- Enh #18783: Add support for URI namespaced tags in `XmlResponseFormatter` (WinterSilence, samdark)
- Bug #18993: Load defaults by `attributes()` in `yii\db\ActiveRecord::loadDefaultValues()` (WinterSilence)
- Bug #19021: Fix return type in PhpDoc `yii\db\Migration` functions `up()`, `down()`, `safeUp()` and `safeDown()` (WinterSilence, rhertogh)
- Bug #19031: Fix displaying console help for parameters with declared types (WinterSilence)
- Bug #19030: Add DI container usage to `yii\base\Widget::end()` (papppeter)
- Bug #19031: Fix displaying console help for parameters with declared types (WinterSilence)
- Bug #19096: Fix `Request::getIsConsoleRequest()` may return erroneously when testing a Web application in Codeception (WinterSilence)
- Enh #13105: Add yiiActiveForm `validate_only` property for skipping form auto-submission (ptolomaues)
- Enh #18328: Raise warning when trying to register a file after `View::endPage()` has been called (perlexed)
- Enh #18762: Add `yii\helpers\Json::$keepObjectType` and `yii\web\JsonResponseFormatter::$keepObjectType` in order to avoid changing zero-indexed objects to array in `yii\helpers\Json::encode()` (zebraf1)
- Enh #18783: Add support for URI namespaced tags in `XmlResponseFormatter` (WinterSilence, samdark)