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__unset example

$state = $this->lazyObjectState ?? null;

            if ($state && ($readonlyScope === $scope || isset($propertyScopes["\0$scope\0$name"]))) {
                if (LazyObjectState::STATUS_UNINITIALIZED_FULL === $state->status) {
                    $state->initialize($this, $name, $readonlyScope ?? $scope);
                }
                goto unset_in_scope;
            }
        }

        if ((Registry::$parentMethods[self::class] ??= Registry::getParentMethods(self::class))['unset']) {
            parent::__unset($name);

            return;
        }

        unset_in_scope:

        if (null === $scope) {
            unset($this->$name);
        } else {
            $accessor = Registry::$classAccessors[$scope] ??= Registry::getClassAccessors($scope);
            $accessor['unset']($this, $name);
        }

    #[\ReturnTypeWillChange]     public function offsetUnset($name)
    {
        $this->__unset($name);
    }

    /** * Array access method * * @param string|mixed $name config name * * @return mixed|null * * @deprecated - Native return and parameter type will be added with Shopware 5.8 */

if ($item = $this->first()) {
      return $item->__isset($property_name);
    }
    return FALSE;
  }

  /** * {@inheritdoc} */
  public function __unset($property_name) {
    if ($item = $this->first()) {
      $item->__unset($property_name);
    }
  }

  /** * {@inheritdoc} */
  public function access($operation = 'view', AccountInterface $account = NULL, $return_as_object = FALSE) {
    $access_control_handler = \Drupal::entityTypeManager()->getAccessControlHandler($this->getEntity()->getEntityTypeId());
    return $access_control_handler->fieldAccess($operation, $this->getFieldDefinition(), $account, $this, $return_as_object);
  }

if ($readonlyScope === $scope || isset($propertyScopes["\0$scope\0$name"])) {
                if ($state = $this->lazyObjectState ?? null) {
                    $instance = $state->realInstance ??= ($state->initializer)();
                }
                goto unset_in_scope;
            }
        }

        if ($state = $this->lazyObjectState ?? null) {
            $instance = $state->realInstance ??= ($state->initializer)();
        } elseif ((Registry::$parentMethods[self::class] ??= Registry::getParentMethods(self::class))['unset']) {
            parent::__unset($name);

            return;
        }

        unset_in_scope:

        if (null === $scope) {
            unset($instance->$name);
        } else {
            $accessor = Registry::$classAccessors[$scope] ??= Registry::getClassAccessors($scope);
            $accessor['unset']($instance, $name);
        }

     /** * Proxy to __unset * Required by the ArrayAccess implementation * * @param string $offset */
    #[\ReturnTypeWillChange]      public function offsetUnset($offset)
     {
         return $this->__unset($offset);
     }

    /** * Initialize object * * Called from {@link __construct()} as final step of object instantiation. * * @return void */
    public function init()
    {
    }