Defines element value callables which are safe to run even when the form state has an invalid CSRF token.
Excluded from this list on purpose:
Type: array
protected $safeCoreValueCallables = [ 'Drupal\Core\Render\Element\Checkbox::valueCallback', 'Drupal\Core\Render\Element\Checkboxes::valueCallback', 'Drupal\Core\Render\Element\Email::valueCallback', 'Drupal\Core\Render\Element\FormElement::valueCallback', 'Drupal\Core\Render\Element\MachineName::valueCallback', 'Drupal\Core\Render\Element\Number::valueCallback', 'Drupal\Core\Render\Element\PathElement::valueCallback', 'Drupal\Core\Render\Element\Password::valueCallback', 'Drupal\Core\Render\Element\PasswordConfirm::valueCallback', 'Drupal\Core\Render\Element\Radio::valueCallback', 'Drupal\Core\Render\Element\Radios::valueCallback', 'Drupal\Core\Render\Element\Range::valueCallback', 'Drupal\Core\Render\Element\Search::valueCallback', 'Drupal\Core\Render\Element\Select::valueCallback', 'Drupal\Core\Render\Element\Tableselect::valueCallback', 'Drupal\Core\Render\Element\Table::valueCallback', 'Drupal\Core\Render\Element\Tel::valueCallback', 'Drupal\Core\Render\Element\Textarea::valueCallback', 'Drupal\Core\Render\Element\Textfield::valueCallback', 'Drupal\Core\Render\Element\Token::valueCallback', 'Drupal\Core\Render\Element\Url::valueCallback', 'Drupal\Core\Render\Element\Weight::valueCallback', ];
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormBuilder.php/property/FormBuilder::safeCoreValueCallables/8.1.x