The pre-defined primitive type that this data type maps to.
If set, it must be a constant defined by \Drupal\Core\TypedData\Primitive such as \Drupal\Core\TypedData\Primitive::STRING.
Type: string
public $primitive_type;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!Annotation!DataType.php/property/DataType::primitive_type/8.1.x