diff --git a/core/lib/Drupal/Core/Field/FieldItemBase.php b/core/lib/Drupal/Core/Field/FieldItemBase.php
index 8ab3ad6..f168001 100644
--- a/core/lib/Drupal/Core/Field/FieldItemBase.php
+++ b/core/lib/Drupal/Core/Field/FieldItemBase.php
@@ -265,4 +265,14 @@ public static function preSaveSettings(array &$settings) { }
    */
   public static function postLoadSettings(array &$settings) { }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function preSaveInstanceSettings(array &$settings) { }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function postLoadInstanceSettings(array &$settings) { }
+
 }
diff --git a/core/lib/Drupal/Core/Field/FieldItemInterface.php b/core/lib/Drupal/Core/Field/FieldItemInterface.php
index f63d36a..8b624c7 100644
--- a/core/lib/Drupal/Core/Field/FieldItemInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldItemInterface.php
@@ -204,6 +204,27 @@ public static function preSaveSettings(array &$settings);
   public static function postLoadSettings(array &$settings);
 
   /**
+   * Defines behavior for transforming instance settings before being saved.
+   *
+   * May be used to alter settings to transform them to a storage-friendly form.
+   *
+   * @param array $settings
+   *   Field settings.
+   */
+  public static function preSaveInstanceSettings(array &$settings);
+
+  /**
+   * Defines custom behavior for transforming instance settings when loading.
+   *
+   * May be used to alter settings to transform them from a storage-friendly
+   * form.
+   *
+   * @param array $settings
+   *   Field settings.
+   */
+  public static function postLoadInstanceSettings(array &$settings);
+
+  /**
    * Defines custom insert behavior for field values.
    *
    * This method is called during the process of inserting an entity, just
diff --git a/core/modules/field/src/Entity/FieldInstanceConfig.php b/core/modules/field/src/Entity/FieldInstanceConfig.php
index 79830db..3a5314d 100644
--- a/core/modules/field/src/Entity/FieldInstanceConfig.php
+++ b/core/modules/field/src/Entity/FieldInstanceConfig.php
@@ -253,7 +253,7 @@ public function __construct(array $values, $entity_type = 'field_instance_config
     }
 
     // Discard the 'field_type' entry that is added in config records to ease
-    // schema generation. See self::toArray().
+    // schema generation and data altering for storage. See self::toArray().
     unset($values['field_type']);
 
     parent::__construct($values, $entity_type);
@@ -287,7 +287,8 @@ public function getType() {
   public function toArray() {
     $properties = parent::toArray();
     // Additionally, include the field type, that is needed to be able to
-    // generate the field-type-dependant parts of the config schema.
+    // generate the field-type-dependant parts of the config schema and to
+    // allow for altering data by field type.
     $properties['field_type'] = $this->getType();
 
     return $properties;
diff --git a/core/modules/field/src/FieldInstanceConfigStorage.php b/core/modules/field/src/FieldInstanceConfigStorage.php
index 20dc083..26dc9f4 100644
--- a/core/modules/field/src/FieldInstanceConfigStorage.php
+++ b/core/modules/field/src/FieldInstanceConfigStorage.php
@@ -177,4 +177,25 @@ public function loadByProperties(array $conditions = array()) {
     return $matching_instances;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function postLoadData(array $data) {
+    // @todo Makes too much assumptions but it needs to.
+    $type_definition = \Drupal::typedDataManager()
+      ->getDefinition('field_item:' . $data['field_type']);
+    $type_definition['class']::postLoadInstanceSettings($data['settings']);
+    return $data;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function preSaveData(array $data) {
+    // @todo Makes too much assumptions but it needs to.
+    $type_definition = \Drupal::typedDataManager()
+      ->getDefinition('field_item:' . $data['field_type']);
+    $type_definition['class']::preSaveInstanceSettings($data['settings']);
+    return $data;
+  }
 }