public FieldItemInterface::__unset($property_name)
Magic method: Unsets a property.
$property_name: The name of the property to get; e.g., 'title' or 'name'.
public function __unset($property_name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemInterface.php/function/FieldItemInterface::__unset/8.1.x