Expanded class hierarchy of UserNameItem in Drupal 10

class \Drupal\Core\TypedData\TypedData implements PluginInspectionInterface, TypedDataInterface uses DependencySerializationTrait, StringTranslationTrait, TypedDataTrait
- class \Drupal\Core\Config\Schema\Element
- class \Drupal\Core\TypedData\DataReferenceBase implements DataReferenceInterface
- class \Drupal\Core\TypedData\Plugin\DataType\ItemList implements \Drupal\Core\TypedData\Plugin\DataType\IteratorAggregate, ListInterface
- class \Drupal\Core\TypedData\Plugin\DataType\Map implements \Drupal\Core\TypedData\Plugin\DataType\IteratorAggregate, ComplexDataInterface
  - class \Drupal\Core\Field\FieldItemBase implements FieldItemInterface
    class \Drupal\comment\Plugin\Field\FieldType\CommentItem implements CommentItemInterface
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\BooleanItem implements OptionsProviderInterface
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\EmailItem
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem implements PreconfiguredFieldUiOptionsInterface, OptionsProviderInterface
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\LanguageItem implements OptionsProviderInterface
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\MapItem
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\NumericItemBase
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\StringItemBase
    class \Drupal\Core\Field\Plugin\Field\FieldType\StringItem
    class \Drupal\Core\Field\Plugin\Field\FieldType\PasswordItem
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\UriItem
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\UuidItem
    
    class \Drupal\entity_test\Plugin\Field\FieldType\ComputedTestCacheableStringItem
    
    class \Drupal\entity_test\Plugin\Field\FieldType\InternalPropertyTestFieldItem
    
    class \Drupal\entity_test\Plugin\Field\FieldType\SingleInternalPropertyTestFieldItem
    
    class \Drupal\user\TimeZoneItem
    
    class \Drupal\user\UserNameItem
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\StringLongItem
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\TimestampItem
    
    class \Drupal\datetime\Plugin\Field\FieldType\DateTimeItem implements DateTimeItemInterface
    
    class \Drupal\entity_test\Plugin\Field\FieldType\FieldTestItem
    
    class \Drupal\entity_test\Plugin\Field\FieldType\SerializedItem
    
    class \Drupal\entity_test\Plugin\Field\FieldType\SerializedPropertyItem
    
    class \Drupal\entity_test\Plugin\Field\FieldType\ShapeItem
    
    class \Drupal\entity_test_update\Plugin\Field\FieldType\MultiValueTestItem
    
    class \Drupal\field_test\Plugin\Field\FieldType\TestItem
    
    class \Drupal\field_test\Plugin\Field\FieldType\TestObjectItem
    
    class \Drupal\image_module_test\Plugin\Field\FieldType\DummyAjaxItem
    
    class \Drupal\layout_builder\Plugin\Field\FieldType\LayoutSectionItem
    
    class \Drupal\link\Plugin\Field\FieldType\LinkItem implements LinkItemInterface
    
    class \Drupal\options\Plugin\Field\FieldType\ListItemBase implements OptionsProviderInterface
    
    class \Drupal\path\Plugin\Field\FieldType\PathItem
    
    class \Drupal\telephone\Plugin\Field\FieldType\TelephoneItem
    
    class \Drupal\text\Plugin\Field\FieldType\TextItemBase
- class \Drupal\Core\TypedData\PrimitiveBase implements PrimitiveInterface
- class \Drupal\datetime\DateTimeComputed
- class \Drupal\entity_test\TypedData\ComputedString implements CacheableDependencyInterface
- class \Drupal\file\ComputedFileUrl
- class \Drupal\layout_builder\Plugin\DataType\SectionData
- class \Drupal\Tests\Core\Plugin\Fixtures\Plugin\DataType\TestDataType
- class \Drupal\text\TextProcessed implements CacheableDependencyInterface

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Expanded class hierarchy of UserNameItem in Drupal 10

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