Expanded class hierarchy of StringItemBase in Drupal 9

class \Drupal\Core\TypedData\TypedData implements PluginInspectionInterface, TypedDataInterface uses DependencySerializationTrait, StringTranslationTrait, TypedDataTrait
- class \Drupal\charts\Plugin\DataType\ChartConfigData
- class \Drupal\Core\Config\Schema\Element
- class \Drupal\Core\Entity\Plugin\DataType\EntityAdapter implements \Drupal\Core\Entity\Plugin\DataType\IteratorAggregate, ComplexDataInterface
- class \Drupal\Core\TypedData\DataReferenceBase implements DataReferenceInterface
- class \Drupal\Core\TypedData\Plugin\DataType\Any
- class \Drupal\Core\TypedData\Plugin\DataType\ItemList implements \Drupal\Core\TypedData\Plugin\DataType\IteratorAggregate, ListInterface
- class \Drupal\Core\TypedData\Plugin\DataType\Language
- class \Drupal\Core\TypedData\Plugin\DataType\Map implements \Drupal\Core\TypedData\Plugin\DataType\IteratorAggregate, ComplexDataInterface
  - class \Drupal\compiler_scss\Plugin\DataType\Number
  - class \Drupal\Core\Field\FieldItemBase implements FieldItemInterface
    class \Drupal\bynder\Plugin\Field\FieldType\BynderMetadataItem
    
    class \Drupal\charts\Plugin\Field\FieldType\ChartConfigItem
    
    class \Drupal\cmis\Plugin\Field\FieldType\CmisField
    
    class \Drupal\comment\Plugin\Field\FieldType\CommentItem implements CommentItemInterface
    
    class \Drupal\computed_field\Plugin\Field\FieldType\ComputedFieldItemBase uses ComputedFieldItemTrait
    
    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\computed_field\Plugin\Field\FieldType\ComputedStringItemBase uses ComputedFieldItemTrait
    
    class \Drupal\Core\Field\Plugin\Field\FieldType\StringItem
    
    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\double_field\Plugin\Field\FieldType\DoubleField
    
    class \Drupal\dropdown\Plugin\Field\FieldType\Dropdown
    
    class \Drupal\dropdown\Plugin\Field\FieldType\Dropdown
    
    class \Drupal\dropdown\Plugin\Field\FieldType\Dropdown
    
    class \Drupal\dropdown\Plugin\Field\FieldType\Dropdown
    
    class \Drupal\duration_field\Plugin\Field\FieldType\DurationField implements FieldItemInterface
    
    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\faqfield\Plugin\Field\FieldType\FaqFieldItem
    
    class \Drupal\farm_id_tag\Plugin\Field\FieldType\IdTagItem
    
    class \Drupal\farm_inventory\Plugin\Field\FieldType\InventoryItem
    
    class \Drupal\field_encrypt\Plugin\Field\FieldType\EncryptedFieldStorageItem
    
    class \Drupal\field_example\Plugin\Field\FieldType\RgbItem
    
    class \Drupal\field_ipaddress\Plugin\Field\FieldType\IpAddressField implements FieldItemInterface
    
    class \Drupal\field_permission_example\Plugin\Field\FieldType\FieldNote
    
    class \Drupal\field_test\Plugin\Field\FieldType\TestItem
    
    class \Drupal\field_test\Plugin\Field\FieldType\TestObjectItem
    
    class \Drupal\field_time\Plugin\Field\FieldType\TimeRangeType
    
    class \Drupal\field_time\Plugin\Field\FieldType\TimeType
    
    class \Drupal\field_token_value\Plugin\Field\FieldType\FieldTokenValueItem
    
    class \Drupal\forward\Plugin\Field\FieldType\ForwardItem
    
    class \Drupal\forward\Plugin\Field\FieldType\ForwardItem
    
    class \Drupal\gdpr_consent\Plugin\Field\FieldType\UserConsentItem
    
    class \Drupal\gdpr_tasks\Plugin\Field\FieldType\TaskLogItem
    
    class \Drupal\hijri\Plugin\Field\FieldType\HijriItem
    
    class \Drupal\hijri\Plugin\Field\FieldType\HijriItem
    
    class \Drupal\image_module_test\Plugin\Field\FieldType\DummyAjaxItem
    
    class \Drupal\jsonapi_image_styles\Plugin\Field\FieldType\ImageStyleNormalizedFieldItem
    
    class \Drupal\layout_builder\Plugin\Field\FieldType\LayoutSectionItem
    
    class \Drupal\link\Plugin\Field\FieldType\LinkItem implements LinkItemInterface
    
    class \Drupal\loqate\Plugin\Field\FieldType\LoqatePcaAddressItem
    
    class \Drupal\mailchimp_lists\Plugin\Field\FieldType\MailchimpListsSubscription
    
    class \Drupal\menu_link\Plugin\Field\FieldType\MenuLinkItem
    
    class \Drupal\mobile_number\Plugin\Field\FieldType\MobileNumberItem
    
    class \Drupal\opigno_certificate\Plugin\Field\FieldType\ViewModeSelectorItem
    
    class \Drupal\opigno_file_upload\Plugin\Field\FieldType\OpignoEvaluationMethodField
    
    class \Drupal\opigno_module\Plugin\Field\FieldType\OpignoTrueFalseFieldType
    
    class \Drupal\options\Plugin\Field\FieldType\ListItemBase implements OptionsProviderInterface
    
    class \Drupal\path\Plugin\Field\FieldType\PathItem
    
    class \Drupal\phone_international\Plugin\Field\FieldType\PhoneInternational implements FieldItemInterface
    
    class \Drupal\price\Plugin\Field\FieldType\PriceItem
    
    class \Drupal\price\Plugin\Field\FieldType\PriceItem
    
    class \Drupal\price\Plugin\Field\FieldType\PriceItem
    
    class \Drupal\price\Plugin\Field\FieldType\PriceItem
    
    class \Drupal\radioactivity\Plugin\Field\FieldType\RadioactivityField
    
    class \Drupal\search_api_federated_solr\Plugin\Field\FieldType\FederatedTerms
    
    class \Drupal\search_api_field_map\Plugin\Field\FieldType\MappedTerms
    
    class \Drupal\signaturefield\Plugin\Field\FieldType\SignatureItem
    
    class \Drupal\telephone\Plugin\Field\FieldType\TelephoneItem
    
    class \Drupal\text\Plugin\Field\FieldType\TextItemBase
    
    class \Drupal\timefield\Plugin\Field\FieldType\TimeField
    
    class \Drupal\time_field\Plugin\Field\FieldType\TimeRangeType
    
    class \Drupal\time_field\Plugin\Field\FieldType\TimeType
    
    class \Drupal\tweet_feed\Plugin\Field\FieldType\UserMentionsFieldType
    
    class \Drupal\twitter_profile_widget\Plugin\Field\FieldType\TwitterWidgetItem
    
    class \Drupal\workflows_field\Plugin\Field\FieldType\WorkflowsFieldItem implements OptionsProviderInterface
    
    class \Drupal\yearonly\Plugin\Field\FieldType\YearOnlyItem implements FieldItemInterface
  - class \Drupal\rules_webform\Plugin\DataType\WebformFields
  - class \Drupal\rules_webform\Plugin\DataType\WebformFieldsUnchanged
  - class \Drupal\rules_webform\Plugin\DataType\WebformInfo
  - class \Drupal\search_api_solr_test\Plugin\DataType\Widget
  - class \Drupal\social_graphql\Plugin\DataType\PageInfo
  - class \Drupal\social_graphql\Plugin\DataType\PageInfo
  - class \Drupal\social_graphql\Plugin\DataType\PageInfo
  - class \Drupal\social_graphql\Plugin\DataType\PageInfo
- class \Drupal\Core\TypedData\PrimitiveBase implements PrimitiveInterface
- class \Drupal\datetime\DateTimeComputed
- class \Drupal\entity_test\TypedData\ComputedString implements CacheableDependencyInterface
- class \Drupal\field_encrypt\EncryptedFieldComputedProperty
- class \Drupal\file\ComputedFileUrl
- class \Drupal\fraction\FractionDecimalProperty
- class \Drupal\fraction\FractionProperty
- class \Drupal\layout_builder\Plugin\DataType\SectionData
- class \Drupal\search_api_solr\Plugin\DataType\SolrDocument implements \Drupal\search_api_solr\Plugin\DataType\IteratorAggregate, ComplexDataInterface
- class \Drupal\search_api_solr\Plugin\DataType\SolrField implements \Drupal\search_api_solr\Plugin\DataType\IteratorAggregate
- class \Drupal\Tests\Core\Plugin\Fixtures\Plugin\DataType\TestDataType
- class \Drupal\text\TextProcessed implements CacheableDependencyInterface

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Expanded class hierarchy of StringItemBase in Drupal 9

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