diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index e901e05..c9084b7 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -428,7 +428,7 @@ public function save() {
       // Ensure that the schema wrapper has the latest data.
       $this->setSchemaWrapper();
       foreach ($this->data as $key => $value) {
-        $this->data[$key] = $this->getTypedValue($key, $value);
+        $this->data[$key] = $this->castValue($key, $value);
       }
     }
 
@@ -496,11 +496,11 @@ public function merge(array $data_to_merge) {
   }
 
   /**
-   * Gets the schema for the whole configuration object.
+   * Gets the schema wrapper for the whole configuration object.
    *
    * @return \Drupal\Core\Config\Schema\Element
    */
-  public function getSchemaWrapper() {
+  protected function getSchemaWrapper() {
     if (empty($this->schemaWrapper)) {
       $this->setSchemaWrapper();
     }
@@ -513,7 +513,7 @@ public function getSchemaWrapper() {
    * @return \Drupal\Core\Config\Config
    *   The configuration object.
    */
-  public function setSchemaWrapper() {
+  protected function setSchemaWrapper() {
     $typed_config_manager = $this->getTypedConfigManager();
     $definition = $typed_config_manager->getDefinition($this->name);
     $this->schemaWrapper = $typed_config_manager->create($definition, $this->data);
@@ -528,7 +528,7 @@ public function setSchemaWrapper() {
    *
    * @return \Drupal\Core\Config\Schema\Element
    */
-  public function getSchemaForKey($key) {
+  protected function getSchemaForKey($key) {
     $parts = explode('.', $key);
     $schema_wrapper = $this->getSchemaWrapper();
     if (count($parts) == 1) {
@@ -549,7 +549,7 @@ public function getSchemaForKey($key) {
   }
 
   /**
-   * Gets the value with the correct data type for this config object.
+   * Casts the value to correct data type using the configuration schema.
    *
    * @param string $key
    *   A string that maps to a key within the configuration data.
@@ -559,14 +559,14 @@ public function getSchemaForKey($key) {
    * @return mixed
    *   The value cast to the type indicated in the schema.
    */
-  public function getTypedValue($key, $value) {
+  protected function castValue($key, $value) {
     if (is_scalar($value) || $value === NULL) {
       try {
         $class = get_class($this->getSchemaForKey($key));
       }
       catch(\Exception $e) {
-        // @todo throw an exception due to an incomplete schema once
-        //   https://drupal.org/node/1910624 is complete.
+        // @todo throw an exception due to an incomplete schema. Only possible
+        //   once https://drupal.org/node/1910624 is complete.
         $class = FALSE;
       }
       switch ($class) {
@@ -594,7 +594,7 @@ public function getTypedValue($key, $value) {
       }
       // Recurse into any nested keys.
       foreach ($value as $nested_value_key => $nested_value) {
-        $value[$nested_value_key] = $this->getTypedValue($key . '.' . $nested_value_key, $nested_value);
+        $value[$nested_value_key] = $this->castValue($key . '.' . $nested_value_key, $nested_value);
       }
     }
     return $value;