+ return static::getDataWithoutInternals($object->toArray());
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function denormalize($data, $class, $format = NULL, array $context = []) {
+ return parent::denormalize(static::getDataWithoutInternals($data), $class, $format, $context);
+ }
+
+ /**
+ * Gets the given data without the internal implementation details.
+ *
+ * @param array $data
+ * The data that is either currently or about to be stored in configuration.
+ *
+ * @return array
+ * The same data, but without internals. Currently, that is only the '_core'
+ * key, which is reserved by Drupal core to handle complex edge cases
+ * correctly. Data in the '_core' key is irrelevant to clients reading
+ * configuration, and is not allowed to be set by clients writing
+ * configuration: it is for Drupal core only, and managed by Drupal core.
+ *
+ * @see https://www.drupal.org/node/2653358
+ */
+ protected static function getDataWithoutInternals(array $data) {
+ return array_diff_key($data, ['_core' => TRUE]);