- Bug #10850: Fixed unable to use 'definitions' and 'aliases' at `yii\widgets\MaskedInput` (rahimov, klimov-paul)
- Bug #10946: Fixed parameters binding to the SQL query in `yii\db\mysqlSchema::findConstraints()` (silverfire)
- Enh #5469: Add mimetype validation by mask in FileValidator (kirsenn, samdark, silverfire)
- Enh #10487:`yii\helpers\BaseArrayHelper::index()` got a third parameter `$groupBy` to group the input array by the key in one or more dimensions (quantum13, silverfire, samdark)