- Enh #12901: Added `getDefaultHelpHeader` method to the `yii\console\controllers\HelpController` class to be able to override default help header in a class heir (diezztsk)
- Enh #13035: Use ArrayHelper::getValue() in SluggableBehavior::getValue() (thyseus)
- Enh #13020: Added `disabledListItemSubTagOptions` attribute for `yii\widgets\LinkPager` in order to customize the disabled list item sub tag element (nadar)
- Enh #12988: Changed `textarea` method within the `yii\helpers\BaseHtml` class to allow users to control whether html entities found within `$value` will be double-encoded or not (cyphix333)
- Enh: Added constants for specifying `yii\validators\CompareValidator::$type` (cebe)