diff --git a/core/includes/file.inc b/core/includes/file.inc
index 858c4a6..60cec1c 100644
--- a/core/includes/file.inc
+++ b/core/includes/file.inc
@@ -1215,8 +1215,9 @@ function file_directory_temp() {
       // everything to use slash which is supported on all platforms.
       $temporary_directory = str_replace('\\', '/', $temporary_directory);
     }
-    // Save the path of the discovered directory.
-    $config->set('path.temporary', $temporary_directory)->save();
+    // Save the path of the discovered directory. Do not check config schema on
+    // save.
+    $config->set('path.temporary', (string) $temporary_directory)->save(TRUE);
   }
 
   return $temporary_directory;
diff --git a/core/includes/install.inc b/core/includes/install.inc
index 7e0e32e..d56c44f 100644
--- a/core/includes/install.inc
+++ b/core/includes/install.inc
@@ -619,9 +619,9 @@ function drupal_install_system($install_state) {
   // Ensure default language is saved.
   if (isset($install_state['parameters']['langcode'])) {
     \Drupal::configFactory()->getEditable('system.site')
-      ->set('langcode', $install_state['parameters']['langcode'])
-      ->set('default_langcode', $install_state['parameters']['langcode'])
-      ->save();
+      ->set('langcode', (string) $install_state['parameters']['langcode'])
+      ->set('default_langcode', (string) $install_state['parameters']['langcode'])
+      ->save(TRUE);
   }
 }
 
diff --git a/core/includes/module.inc b/core/includes/module.inc
index 0f1b0d8..8f8bf9c 100644
--- a/core/includes/module.inc
+++ b/core/includes/module.inc
@@ -179,10 +179,12 @@ function drupal_required_modules() {
 function module_set_weight($module, $weight) {
   $extension_config = \Drupal::configFactory()->getEditable('core.extension');
   if ($extension_config->get("module.$module") !== NULL) {
+    // Pre-cast the $weight to an integer so that we can save this without using
+    // schema. This is a performance improvement for module installation.
     $extension_config
-      ->set("module.$module", $weight)
+      ->set("module.$module", (int) $weight)
       ->set('module', module_config_sort($extension_config->get('module')))
-      ->save();
+      ->save(TRUE);
 
     // Prepare the new module list, sorted by weight, including filenames.
     // @see \Drupal\Core\Extension\ModuleHandler::install()
diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index 51ade6c..8861481 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -203,22 +203,24 @@ public function clear($key) {
   /**
    * {@inheritdoc}
    */
-  public function save() {
+  public function save($has_trusted_data = FALSE) {
     // Validate the configuration object name before saving.
     static::validateName($this->name);
 
     // If there is a schema for this configuration object, cast all values to
     // conform to the schema.
-    if ($this->typedConfigManager->hasConfigSchema($this->name)) {
-      // Ensure that the schema wrapper has the latest data.
-      $this->schemaWrapper = NULL;
-      foreach ($this->data as $key => $value) {
-        $this->data[$key] = $this->castValue($key, $value);
+    if (!$has_trusted_data) {
+      if ($this->typedConfigManager->hasConfigSchema($this->name)) {
+        // Ensure that the schema wrapper has the latest data.
+        $this->schemaWrapper = NULL;
+        foreach ($this->data as $key => $value) {
+          $this->data[$key] = $this->castValue($key, $value);
+        }
       }
-    }
-    else {
-      foreach ($this->data as $key => $value) {
-        $this->validateValue($key, $value);
+      else {
+        foreach ($this->data as $key => $value) {
+          $this->validateValue($key, $value);
+        }
       }
     }
 
@@ -302,4 +304,5 @@ public function getOriginal($key = '', $apply_overrides = TRUE) {
       }
     }
   }
+
 }
diff --git a/core/lib/Drupal/Core/Config/ConfigInstaller.php b/core/lib/Drupal/Core/Config/ConfigInstaller.php
index c109ea7..082fa63 100644
--- a/core/lib/Drupal/Core/Config/ConfigInstaller.php
+++ b/core/lib/Drupal/Core/Config/ConfigInstaller.php
@@ -304,11 +304,11 @@ protected function createConfiguration($collection, array $config_to_create) {
           $entity = $entity_storage->createFromStorageRecord($new_config->get());
         }
         if ($entity->isInstallable()) {
-          $entity->save();
+          $entity->trustData()->save();
         }
       }
       else {
-        $new_config->save();
+        $new_config->save(TRUE);
       }
     }
   }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
index 0ca35a5..56603c7 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
@@ -106,6 +106,13 @@
   protected $third_party_settings = array();
 
   /**
+   * Trust supplied data and not use configuration schema on save.
+   *
+   * @var bool
+   */
+  protected $trustedData = FALSE;
+
+  /**
    * Overrides Entity::__construct().
    */
   public function __construct(array $values, $entity_type) {
@@ -265,22 +272,31 @@ public static function sort(ConfigEntityInterface $a, ConfigEntityInterface $b)
    */
   public function toArray() {
     $properties = array();
-    $config_name = $this->getEntityType()->getConfigPrefix() . '.' . $this->id();
-    $definition = $this->getTypedConfig()->getDefinition($config_name);
-    if (!isset($definition['mapping'])) {
-      throw new SchemaIncompleteException(SafeMarkup::format('Incomplete or missing schema for @config_name', array('@config_name' => $config_name)));
+    /** @var \Drupal\Core\Config\Entity\ConfigEntityTypeInterface $entity_type */
+    $entity_type = $this->getEntityType();
+
+    $properties_to_export = $entity_type->getPropertiesToExport();
+    if (empty($properties_to_export)) {
+      $config_name = $entity_type->getConfigPrefix() . '.' . $this->id();
+      $definition = $this->getTypedConfig()->getDefinition($config_name);
+      if (!isset($definition['mapping'])) {
+        throw new SchemaIncompleteException(SafeMarkup::format('Incomplete or missing schema for @config_name', array('@config_name' => $config_name)));
+      }
+      $properties_to_export = array_combine(array_keys($definition['mapping']), array_keys($definition['mapping']));
     }
-    $id_key = $this->getEntityType()->getKey('id');
-    foreach (array_keys($definition['mapping']) as $name) {
+
+    $id_key = $entity_type->getKey('id');
+    foreach ($properties_to_export as $property_name => $export_name) {
       // Special handling for IDs so that computed compound IDs work.
       // @see \Drupal\Core\Entity\EntityDisplayBase::id()
-      if ($name == $id_key) {
-        $properties[$name] = $this->id();
+      if ($property_name == $id_key) {
+        $properties[$export_name] = $this->id();
       }
       else {
-        $properties[$name] = $this->get($name);
+        $properties[$export_name] = $this->get($property_name);
       }
     }
+
     if (empty($this->third_party_settings)) {
       unset($properties['third_party_settings']);
     }
@@ -328,7 +344,7 @@ public function preSave(EntityStorageInterface $storage) {
         throw new ConfigDuplicateUUIDException(SafeMarkup::format('Attempt to save a configuration entity %id with UUID %uuid when this entity already exists with UUID %original_uuid', array('%id' => $this->id(), '%uuid' => $this->uuid(), '%original_uuid' => $original->uuid())));
       }
     }
-    if (!$this->isSyncing()) {
+    if (!$this->isSyncing() && !$this->trustedData) {
       // Ensure the correct dependencies are present. If the configuration is
       // being written during a configuration synchronization then there is no
       // need to recalculate the dependencies.
@@ -572,4 +588,28 @@ public function isInstallable() {
     return TRUE;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function trustData() {
+    $this->trustedData = TRUE;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasTrustedData() {
+    return $this->trustedData;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save() {
+    $return = parent::save();
+    $this->trustedData = FALSE;
+    return $return;
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php
index 3d688a5..76809ed 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityInterface.php
@@ -203,4 +203,27 @@ public function getDependencies();
    */
   public function isInstallable();
 
+  /**
+   * Sets that the data should be trusted.
+   *
+   * If the data is trusted then dependencies will not be calculated on save and
+   * schema will not be used to cast the values. Generally this is only used
+   * during module and theme installation. Once the config entity has been saved
+   * the data will no longer be marked as trusted. This is an optimization for
+   * creation of configuration during installation.
+   *
+   * @return $this
+   *
+   * @see \Drupal\Core\Config\ConfigInstaller::createConfiguration()
+   */
+  public function trustData();
+
+  /**
+   * Gets whether on not the data is trusted.
+   *
+   * @return bool
+   *   TRUE if the configuration data is trusted, FALSE if not.
+   */
+  public function hasTrustedData();
+
 }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php
index 2c3e798..540fa15 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityStorage.php
@@ -256,7 +256,7 @@ protected function doSave($id, EntityInterface $entity) {
 
     // Retrieve the desired properties and set them in config.
     $config->setData($this->mapToStorageRecord($entity));
-    $config->save();
+    $config->save($entity->hasTrustedData());
 
     return $is_new ? SAVED_NEW : SAVED_UPDATED;
   }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php
index 0cb9772..f15eef5 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php
@@ -35,6 +35,22 @@ class ConfigEntityType extends EntityType implements ConfigEntityTypeInterface {
   protected $static_cache = FALSE;
 
   /**
+   * The list of configuration entity properties to export from the annotation.
+   *
+   * @var array
+   */
+  protected $config_export = [];
+
+  /**
+   * The result of merging config_export annotation with the defaults.
+   *
+   * This is stored on the class so that it does not have to be recalculated.
+   *
+   * @var array
+   */
+  protected $mergedConfigExport = [];
+
+  /**
    * {@inheritdoc}
    *
    * @throws \Drupal\Core\Config\Entity\Exception\ConfigEntityStorageClassException
@@ -146,4 +162,32 @@ protected function checkStorageClass($class) {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getPropertiesToExport() {
+    if (!empty($this->config_export)) {
+      if (empty($this->mergedConfigExport)) {
+        // Always add default properties to be exported.
+        $this->mergedConfigExport = [
+          'uuid' => 'uuid',
+          'langcode' => 'langcode',
+          'status' => 'status',
+          'dependencies' => 'dependencies',
+          'third_party_settings' => 'third_party_settings',
+        ];
+        foreach ($this->config_export as $property => $name) {
+          if (is_numeric($property)) {
+            $this->mergedConfigExport[$name] = $name;
+          }
+          else {
+            $this->mergedConfigExport[$property] = $name;
+          }
+        }
+      }
+      return $this->mergedConfigExport;
+    }
+    return NULL;
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityTypeInterface.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityTypeInterface.php
index a24c96f..0f26ae0 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityTypeInterface.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityTypeInterface.php
@@ -61,4 +61,13 @@
    */
   public function getConfigPrefix();
 
+  /**
+   * Gets the config entity properties to export if declared on the annotation.
+   *
+   * @return array|NULL
+   *   The properties to export or NULL if they can not be determine from the
+   *   config entity type annotation.
+   */
+  public function getPropertiesToExport();
+
 }
diff --git a/core/lib/Drupal/Core/Config/ImmutableConfig.php b/core/lib/Drupal/Core/Config/ImmutableConfig.php
index e6938fb..8435f71 100644
--- a/core/lib/Drupal/Core/Config/ImmutableConfig.php
+++ b/core/lib/Drupal/Core/Config/ImmutableConfig.php
@@ -44,7 +44,7 @@ public function clear($key) {
   /**
    * {@inheritdoc}
    */
-  public function save() {
+  public function save($has_trusted_data = FALSE) {
     throw new ImmutableConfigException(SafeMarkup::format('Can not save immutable configuration !name. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object', ['!name' => $this->getName()]));
   }
 
diff --git a/core/lib/Drupal/Core/Config/StorableConfigBase.php b/core/lib/Drupal/Core/Config/StorableConfigBase.php
index 625900c..d5ea532 100644
--- a/core/lib/Drupal/Core/Config/StorableConfigBase.php
+++ b/core/lib/Drupal/Core/Config/StorableConfigBase.php
@@ -66,11 +66,18 @@
   /**
    * Saves the configuration object.
    *
+   * @param bool $has_trusted_data
+   *   Set to TRUE is the configuration data has already been checked to ensure
+   *   it conforms to schema. Generally this is only used during module and
+   *   theme installation.
+   *
    * Must invalidate the cache tags associated with the configuration object.
    *
    * @return $this
+   *
+   * @see \Drupal\Core\Config\ConfigInstaller::createConfiguration()
    */
-  abstract public function save();
+  abstract public function save($has_trusted_data = FALSE);
 
   /**
    * Deletes the configuration object.
diff --git a/core/lib/Drupal/Core/Datetime/Entity/DateFormat.php b/core/lib/Drupal/Core/Datetime/Entity/DateFormat.php
index f8bb442..fa1de86 100644
--- a/core/lib/Drupal/Core/Datetime/Entity/DateFormat.php
+++ b/core/lib/Drupal/Core/Datetime/Entity/DateFormat.php
@@ -25,7 +25,13 @@
  *     "label" = "label"
  *   },
  *   admin_permission = "administer site configuration",
- *   list_cache_tags = { "rendered" }
+ *   list_cache_tags = { "rendered" },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "locked",
+ *     "pattern",
+ *   }
  * )
  */
 class DateFormat extends ConfigEntityBase implements DateFormatInterface {
diff --git a/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php b/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php
index ae4b46d..d0280a0 100644
--- a/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php
+++ b/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php
@@ -23,6 +23,14 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "status" = "status"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "targetEntityType",
+ *     "bundle",
+ *     "mode",
+ *     "content",
+ *     "hidden",
  *   }
  * )
  */
diff --git a/core/lib/Drupal/Core/Entity/Entity/EntityFormMode.php b/core/lib/Drupal/Core/Entity/Entity/EntityFormMode.php
index 7f8371a..1fed80c 100644
--- a/core/lib/Drupal/Core/Entity/Entity/EntityFormMode.php
+++ b/core/lib/Drupal/Core/Entity/Entity/EntityFormMode.php
@@ -33,6 +33,12 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "targetEntityType",
+ *     "cache",
  *   }
  * )
  */
diff --git a/core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php b/core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php
index 5b28f76..db56e8b 100644
--- a/core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php
+++ b/core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php
@@ -24,6 +24,14 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "status" = "status"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "targetEntityType",
+ *     "bundle",
+ *     "mode",
+ *     "content",
+ *     "hidden",
  *   }
  * )
  */
diff --git a/core/lib/Drupal/Core/Entity/Entity/EntityViewMode.php b/core/lib/Drupal/Core/Entity/Entity/EntityViewMode.php
index 80a3875..08eb661 100644
--- a/core/lib/Drupal/Core/Entity/Entity/EntityViewMode.php
+++ b/core/lib/Drupal/Core/Entity/Entity/EntityViewMode.php
@@ -35,6 +35,12 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "targetEntityType",
+ *     "cache",
  *   }
  * )
  */
diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index caddbad..6f65a73 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -155,10 +155,12 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
         // exceptions if the configuration is not valid.
         $config_installer->checkConfigurationToInstall('module', $module);
 
+        // Save this data without checking schema. This is a performance
+        // improvement for module installation.
         $extension_config
           ->set("module.$module", 0)
           ->set('module', module_config_sort($extension_config->get('module')))
-          ->save();
+          ->save(TRUE);
 
         // Prepare the new module list, sorted by weight, including filenames.
         // This list is used for both the ModuleHandler and DrupalKernel. It
@@ -385,8 +387,9 @@ public function uninstall(array $module_list, $uninstall_dependents = TRUE) {
       // Remove the schema.
       drupal_uninstall_schema($module);
 
-      // Remove the module's entry from the config.
-      \Drupal::configFactory()->getEditable('core.extension')->clear("module.$module")->save();
+      // Remove the module's entry from the config. Don't check schema when
+      // uninstalling a module since we are only clearing a key.
+      \Drupal::configFactory()->getEditable('core.extension')->clear("module.$module")->save(TRUE);
 
       // Update the module handler to remove the module.
       // The current ModuleHandler instance is obsolete with the kernel rebuild
diff --git a/core/lib/Drupal/Core/Extension/ThemeHandler.php b/core/lib/Drupal/Core/Extension/ThemeHandler.php
index 57a317e..9d790ae 100644
--- a/core/lib/Drupal/Core/Extension/ThemeHandler.php
+++ b/core/lib/Drupal/Core/Extension/ThemeHandler.php
@@ -260,10 +260,11 @@ public function install(array $theme_list, $install_dependencies = TRUE) {
       // configuration then stop installing.
       $this->configInstaller->checkConfigurationToInstall('theme', $key);
 
-      // The value is not used; the weight is ignored for themes currently.
+      // The value is not used; the weight is ignored for themes currently. Do
+      // not check schema when saving the configuration.
       $extension_config
         ->set("theme.$key", 0)
-        ->save();
+        ->save(TRUE);
 
       // Add the theme to the current list.
       // @todo Remove all code that relies on $status property.
@@ -358,7 +359,9 @@ public function uninstall(array $theme_list) {
       $this->configManager->uninstall('theme', $key);
 
     }
-    $extension_config->save();
+    // Don't check schema when uninstalling a theme since we are only clearing
+    // keys.
+    $extension_config->save(TRUE);
     $this->state->set('system.theme.data', $current_theme_data);
 
     $this->resetSystem();
diff --git a/core/lib/Drupal/Core/Field/Entity/BaseFieldOverride.php b/core/lib/Drupal/Core/Field/Entity/BaseFieldOverride.php
index 7755187..32862d1 100644
--- a/core/lib/Drupal/Core/Field/Entity/BaseFieldOverride.php
+++ b/core/lib/Drupal/Core/Field/Entity/BaseFieldOverride.php
@@ -28,6 +28,20 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "field_name",
+ *     "entity_type",
+ *     "bundle",
+ *     "label",
+ *     "description",
+ *     "required",
+ *     "translatable",
+ *     "default_value",
+ *     "default_value_callback",
+ *     "settings",
+ *     "field_type",
  *   }
  * )
  */
diff --git a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
index 0354e25..2ad8dc5 100644
--- a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
+++ b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
@@ -260,14 +260,14 @@ public function validateForm(array &$form, FormStateInterface $form_state) {
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $this->config('system.site')
-      ->set('name', $form_state->getValue('site_name'))
-      ->set('mail', $form_state->getValue('site_mail'))
-      ->save();
+      ->set('name', (string) $form_state->getValue('site_name'))
+      ->set('mail', (string) $form_state->getValue('site_mail'))
+      ->save(TRUE);
 
     $this->config('system.date')
-      ->set('timezone.default', $form_state->getValue('date_default_timezone'))
-      ->set('country.default', $form_state->getValue('site_default_country'))
-      ->save();
+      ->set('timezone.default', (string) $form_state->getValue('date_default_timezone'))
+      ->set('country.default', (string) $form_state->getValue('site_default_country'))
+      ->save(TRUE);
 
     $account_values = $form_state->getValue('account');
 
@@ -281,7 +281,7 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
       if ($update_status_module[2]) {
         // Reset the configuration factory so it is updated with the new module.
         $this->resetConfigFactory();
-        $this->config('update.settings')->set('notification.emails', array($account_values['mail']))->save();
+        $this->config('update.settings')->set('notification.emails', array($account_values['mail']))->save(TRUE);
       }
     }
 
diff --git a/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php b/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php
index a52601c..d09f714 100644
--- a/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php
+++ b/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php
@@ -130,20 +130,29 @@ public function loadMultipleOverrides(array $ids) {
   public function saveOverride($id, array $definition) {
     // Only allow to override a specific subset of the keys.
     $expected = array(
-      'menu_name' => 1,
-      'parent' => 1,
-      'weight' => 1,
-      'expanded' => 1,
-      'enabled' => 1,
+      'menu_name' => '',
+      'parent' => '',
+      'weight' => 0,
+      'expanded' => FALSE,
+      'enabled' => FALSE,
     );
     // Filter the overrides to only those that are expected.
     $definition = array_intersect_key($definition, $expected);
+    // Ensure all values are set.
+    $definition = $definition + $expected;
     if ($definition) {
+      // Cast keys to avoid config schema during save.
+      $definition['menu_name'] = (string) $definition['menu_name'];
+      $definition['parent'] = (string) $definition['parent'];
+      $definition['weight'] = (int) $definition['weight'];
+      $definition['expanded'] = (bool) $definition['expanded'];
+      $definition['enabled'] = (bool) $definition['enabled'];
+
       $id = static::encodeId($id);
       $all_overrides = $this->getConfig()->get('definitions');
       // Combine with any existing data.
       $all_overrides[$id] = $definition + $this->loadOverride($id);
-      $this->getConfig()->set('definitions', $all_overrides)->save();
+      $this->getConfig()->set('definitions', $all_overrides)->save(TRUE);
     }
     return array_keys($definition);
   }
diff --git a/core/modules/block/src/Entity/Block.php b/core/modules/block/src/Entity/Block.php
index 4af2f80..019f997 100644
--- a/core/modules/block/src/Entity/Block.php
+++ b/core/modules/block/src/Entity/Block.php
@@ -38,6 +38,16 @@
  *   links = {
  *     "delete-form" = "/admin/structure/block/manage/{block}/delete",
  *     "edit-form" = "/admin/structure/block/manage/{block}"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "theme",
+ *     "region",
+ *     "weight",
+ *     "provider",
+ *     "plugin",
+ *     "settings",
+ *     "visibility",
  *   }
  * )
  */
diff --git a/core/modules/block_content/src/Entity/BlockContentType.php b/core/modules/block_content/src/Entity/BlockContentType.php
index 81b64e9..8494814 100644
--- a/core/modules/block_content/src/Entity/BlockContentType.php
+++ b/core/modules/block_content/src/Entity/BlockContentType.php
@@ -38,6 +38,12 @@
  *     "delete-form" = "/admin/structure/block/block-content/manage/{block_content_type}/delete",
  *     "edit-form" = "/admin/structure/block/block-content/manage/{block_content_type}",
  *     "collection" = "/admin/structure/block/block-content/types",
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "revision",
+ *     "description",
  *   }
  * )
  */
diff --git a/core/modules/book/config/install/node.type.book.yml b/core/modules/book/config/install/node.type.book.yml
index 1a5cc16..a5076b2 100644
--- a/core/modules/book/config/install/node.type.book.yml
+++ b/core/modules/book/config/install/node.type.book.yml
@@ -1,6 +1,8 @@
 langcode: en
 status: true
 dependencies:
+  module:
+    - book
   enforced:
     module:
       - book
diff --git a/core/modules/comment/src/Entity/CommentType.php b/core/modules/comment/src/Entity/CommentType.php
index fb41442..94fd193 100644
--- a/core/modules/comment/src/Entity/CommentType.php
+++ b/core/modules/comment/src/Entity/CommentType.php
@@ -38,6 +38,12 @@
  *     "edit-form" = "/admin/structure/comment/manage/{comment_type}",
  *     "add-form" = "/admin/structure/comment/types/add",
  *     "collection" = "/admin/structure/comment/types",
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "target_entity_type_id",
+ *     "description",
  *   }
  * )
  */
diff --git a/core/modules/config/src/Tests/ConfigInstallTest.php b/core/modules/config/src/Tests/ConfigInstallTest.php
index 00ec4fa..2d09548 100644
--- a/core/modules/config/src/Tests/ConfigInstallTest.php
+++ b/core/modules/config/src/Tests/ConfigInstallTest.php
@@ -53,7 +53,7 @@ function testModuleInstallation() {
 
     // Ensure that schema provided by modules that are not installed is not
     // available.
-    $this->assertFalse(\Drupal::service('config.typed')->hasConfigSchema('config_schema_test.schema_in_install'), 'Configuration schema for config_schema_test.schema_in_install does not exist.');
+    $this->assertFalse(\Drupal::service('config.typed')->hasConfigSchema('config_schema_test.someschema'), 'Configuration schema for config_schema_test.someschema does not exist.');
 
     // Install the test module.
     $this->installModules(array('config_test'));
@@ -80,16 +80,12 @@ function testModuleInstallation() {
     $this->installConfig(array('config_schema_test'));
 
     // After module installation the new schema should exist.
-    $this->assertTrue(\Drupal::service('config.typed')->hasConfigSchema('config_schema_test.schema_in_install'), 'Configuration schema for config_schema_test.schema_in_install exists.');
-
-    // Ensure that data type casting is applied during config installation.
-    $config = $this->config('config_schema_test.schema_in_install');
-    $this->assertIdentical($config->get('integer'), 1);
+    $this->assertTrue(\Drupal::service('config.typed')->hasConfigSchema('config_schema_test.someschema'), 'Configuration schema for config_schema_test.someschema exists.');
 
     // Test that uninstalling configuration removes configuration schema.
     $this->config('core.extension')->set('module', array())->save();
     \Drupal::service('config.manager')->uninstall('module', 'config_test');
-    $this->assertFalse(\Drupal::service('config.typed')->hasConfigSchema('config_schema_test.schema_in_install'), 'Configuration schema for config_schema_test.schema_in_install does not exist.');
+    $this->assertFalse(\Drupal::service('config.typed')->hasConfigSchema('config_schema_test.someschema'), 'Configuration schema for config_schema_test.someschema does not exist.');
   }
 
   /**
diff --git a/core/modules/config/src/Tests/ConfigSchemaTest.php b/core/modules/config/src/Tests/ConfigSchemaTest.php
index 8a8f649..11865ef 100644
--- a/core/modules/config/src/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/src/Tests/ConfigSchemaTest.php
@@ -209,6 +209,7 @@ function testSchemaMapping() {
 
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for the first effect of image.style.medium');
 
+    $a = \Drupal::config('config_test.dynamic.third_party');
     $test = \Drupal::service('config.typed')->get('config_test.dynamic.third_party')->get('third_party_settings.config_schema_test');
     $definition = $test->getDataDefinition()->toArray();
     $expected = array();
diff --git a/core/modules/config/tests/config_schema_test/config/install/config_schema_test.schema_in_install.yml b/core/modules/config/tests/config_schema_test/config/install/config_schema_test.schema_in_install.yml
deleted file mode 100644
index 2ae0ace..0000000
--- a/core/modules/config/tests/config_schema_test/config/install/config_schema_test.schema_in_install.yml
+++ /dev/null
@@ -1 +0,0 @@
-integer: '1'
diff --git a/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml b/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
index 7c18496..a41dd39 100644
--- a/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
+++ b/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
@@ -125,14 +125,6 @@ config_schema_test.schema_data_types:
       sequence:
         - type: boolean
 
-config_schema_test.schema_in_install:
-  label: 'Schema test data with parenting'
-  type: config_object
-  mapping:
-    integer:
-      type: integer
-      label: 'Integer'
-
 config_schema_test_integer:
   type: integer
   label: 'Config test integer'
diff --git a/core/modules/config/tests/config_test/config/install/config_test.types.yml b/core/modules/config/tests/config_test/config/install/config_test.types.yml
index 060a2b0..6c27522 100644
--- a/core/modules/config/tests/config_test/config/install/config_test.types.yml
+++ b/core/modules/config/tests/config_test/config/install/config_test.types.yml
@@ -2,7 +2,7 @@ array: []
 boolean: true
 exp: 1.2e+34
 float: 3.14159
-float_as_integer: 1
+float_as_integer: !!float 1
 hex: 0xC
 int: 99
 octal: 0775
diff --git a/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override.yml b/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override.yml
index 9721190..af26b07 100644
--- a/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override.yml
+++ b/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override.yml
@@ -3,4 +3,4 @@ id: override
 label: Default
 weight: 0
 protected_property: Default
-status: 1
+status: true
diff --git a/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override_unmet.yml b/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override_unmet.yml
index 7fa7ae4..82a9c3c 100644
--- a/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override_unmet.yml
+++ b/core/modules/config/tests/config_test/config/optional/config_test.dynamic.override_unmet.yml
@@ -4,7 +4,7 @@ id: override_unmet
 label: Default
 weight: 0
 protected_property: Default
-status: 1
+status: true
 dependencies:
   module:
     - tour
diff --git a/core/modules/contact/src/Entity/ContactForm.php b/core/modules/contact/src/Entity/ContactForm.php
index c0cf26a..0967c90 100644
--- a/core/modules/contact/src/Entity/ContactForm.php
+++ b/core/modules/contact/src/Entity/ContactForm.php
@@ -36,6 +36,13 @@
  *     "delete-form" = "/admin/structure/contact/manage/{contact_form}/delete",
  *     "edit-form" = "/admin/structure/contact/manage/{contact_form}",
  *     "collection" = "/admin/structure/contact",
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "recipients",
+ *     "reply",
+ *     "weight",
  *   }
  * )
  */
diff --git a/core/modules/editor/src/Entity/Editor.php b/core/modules/editor/src/Entity/Editor.php
index 60cdf5a..159c9b1 100644
--- a/core/modules/editor/src/Entity/Editor.php
+++ b/core/modules/editor/src/Entity/Editor.php
@@ -18,6 +18,12 @@
  *   label = @Translation("Text Editor"),
  *   entity_keys = {
  *     "id" = "format"
+ *   },
+ *   config_export = {
+ *     "format",
+ *     "editor",
+ *     "settings",
+ *     "image_upload",
  *   }
  * )
  */
diff --git a/core/modules/field/src/Entity/FieldConfig.php b/core/modules/field/src/Entity/FieldConfig.php
index d7f2dd0..296d618 100644
--- a/core/modules/field/src/Entity/FieldConfig.php
+++ b/core/modules/field/src/Entity/FieldConfig.php
@@ -28,6 +28,20 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "field_name",
+ *     "entity_type",
+ *     "bundle",
+ *     "label",
+ *     "description",
+ *     "required",
+ *     "translatable",
+ *     "default_value",
+ *     "default_value_callback",
+ *     "settings",
+ *     "field_type",
  *   }
  * )
  */
diff --git a/core/modules/field/src/Entity/FieldStorageConfig.php b/core/modules/field/src/Entity/FieldStorageConfig.php
index ca77119..97db63f 100644
--- a/core/modules/field/src/Entity/FieldStorageConfig.php
+++ b/core/modules/field/src/Entity/FieldStorageConfig.php
@@ -30,6 +30,19 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "id"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "field_name",
+ *     "entity_type",
+ *     "type",
+ *     "settings",
+ *     "module",
+ *     "locked",
+ *     "cardinality",
+ *     "translatable",
+ *     "indexes",
+ *     "persist_with_no_fields",
  *   }
  * )
  */
diff --git a/core/modules/field/tests/src/Unit/FieldConfigEntityUnitTest.php b/core/modules/field/tests/src/Unit/FieldConfigEntityUnitTest.php
index 49d34e2..2bce97d 100644
--- a/core/modules/field/tests/src/Unit/FieldConfigEntityUnitTest.php
+++ b/core/modules/field/tests/src/Unit/FieldConfigEntityUnitTest.php
@@ -22,7 +22,7 @@ class FieldConfigEntityUnitTest extends UnitTestCase {
   /**
    * The entity type used for testing.
    *
-   * @var \Drupal\Core\Entity\EntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
+   * @var \Drupal\Core\Config\Entity\ConfigEntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
    */
   protected $entityType;
 
diff --git a/core/modules/field/tests/src/Unit/FieldStorageConfigEntityUnitTest.php b/core/modules/field/tests/src/Unit/FieldStorageConfigEntityUnitTest.php
index cd05b9b..424424a 100644
--- a/core/modules/field/tests/src/Unit/FieldStorageConfigEntityUnitTest.php
+++ b/core/modules/field/tests/src/Unit/FieldStorageConfigEntityUnitTest.php
@@ -19,13 +19,6 @@
 class FieldStorageConfigEntityUnitTest extends UnitTestCase {
 
   /**
-   * The entity type used for testing.
-   *
-   * @var \Drupal\Core\Entity\EntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
-   */
-  protected $entityType;
-
-  /**
    * The entity manager used for testing.
    *
    * @var \Drupal\Core\Entity\EntityManagerInterface|\PHPUnit_Framework_MockObject_MockObject
@@ -64,7 +57,7 @@ protected function setUp() {
    */
   public function testCalculateDependencies() {
     // Create a mock entity type for FieldStorageConfig.
-    $fieldStorageConfigentityType = $this->getMock('\Drupal\Core\Entity\EntityTypeInterface');
+    $fieldStorageConfigentityType = $this->getMock('\Drupal\Core\Config\Entity\ConfigEntityTypeInterface');
     $fieldStorageConfigentityType->expects($this->any())
       ->method('getProvider')
       ->will($this->returnValue('field'));
diff --git a/core/modules/file/config/optional/views.view.files.yml b/core/modules/file/config/optional/views.view.files.yml
index 23bfd82..fc1b540 100644
--- a/core/modules/file/config/optional/views.view.files.yml
+++ b/core/modules/file/config/optional/views.view.files.yml
@@ -236,7 +236,7 @@ display:
           delta_first_last: false
           multi_type: separator
           separator: ', '
-          field_api_classes: 0
+          field_api_classes: false
           plugin_id: field
           entity_type: file
           entity_field: filename
diff --git a/core/modules/filter/src/Entity/FilterFormat.php b/core/modules/filter/src/Entity/FilterFormat.php
index 6df0f97..cf61f7f 100644
--- a/core/modules/filter/src/Entity/FilterFormat.php
+++ b/core/modules/filter/src/Entity/FilterFormat.php
@@ -41,6 +41,13 @@
  *   links = {
  *     "edit-form" = "/admin/config/content/formats/manage/{filter_format}",
  *     "disable" = "/admin/config/content/formats/manage/{filter_format}/disable"
+ *   },
+ *   config_export = {
+ *     "name",
+ *     "format",
+ *     "weight",
+ *     "roles",
+ *     "filters",
  *   }
  * )
  */
diff --git a/core/modules/forum/config/install/node.type.forum.yml b/core/modules/forum/config/install/node.type.forum.yml
index 8ed965d..b03afe0 100644
--- a/core/modules/forum/config/install/node.type.forum.yml
+++ b/core/modules/forum/config/install/node.type.forum.yml
@@ -1,6 +1,8 @@
 langcode: en
 status: true
 dependencies:
+  module:
+    - forum
   enforced:
     module:
       - forum
diff --git a/core/modules/forum/config/install/taxonomy.vocabulary.forums.yml b/core/modules/forum/config/install/taxonomy.vocabulary.forums.yml
index 951e4a3..cfbcca5 100644
--- a/core/modules/forum/config/install/taxonomy.vocabulary.forums.yml
+++ b/core/modules/forum/config/install/taxonomy.vocabulary.forums.yml
@@ -1,6 +1,8 @@
 langcode: en
 status: true
 dependencies:
+  module:
+    - forum
   enforced:
     module:
       - forum
diff --git a/core/modules/image/src/Entity/ImageStyle.php b/core/modules/image/src/Entity/ImageStyle.php
index a3c7ab5..a05d3a8 100644
--- a/core/modules/image/src/Entity/ImageStyle.php
+++ b/core/modules/image/src/Entity/ImageStyle.php
@@ -48,6 +48,11 @@
  *     "edit-form" = "/admin/config/media/image-styles/manage/{image_style}",
  *     "delete-form" = "/admin/config/media/image-styles/manage/{image_style}/delete",
  *     "collection" = "/admin/config/media/image-styles",
+ *   },
+ *   config_export = {
+ *     "name",
+ *     "label",
+ *     "effects",
  *   }
  * )
  */
diff --git a/core/modules/language/src/Config/LanguageConfigOverride.php b/core/modules/language/src/Config/LanguageConfigOverride.php
index 5be48ad..b673f34 100644
--- a/core/modules/language/src/Config/LanguageConfigOverride.php
+++ b/core/modules/language/src/Config/LanguageConfigOverride.php
@@ -50,13 +50,16 @@ public function __construct($name, StorageInterface $storage, TypedConfigManager
   /**
    * {@inheritdoc}
    */
-  public function save() {
-    // @todo Use configuration schema to validate.
-    //   https://drupal.org/node/2270399
-    // Perform basic data validation.
-    foreach ($this->data as $key => $value) {
-      $this->validateValue($key, $value);
+  public function save($has_trusted_data = FALSE) {
+    if (!$has_trusted_data) {
+      // @todo Use configuration schema to validate.
+      //   https://drupal.org/node/2270399
+      // Perform basic data validation.
+      foreach ($this->data as $key => $value) {
+        $this->validateValue($key, $value);
+      }
     }
+
     $this->storage->write($this->name, $this->data);
     // Invalidate the cache tags not only when updating, but also when creating,
     // because a language config override object uses the same cache tag as the
diff --git a/core/modules/node/config/install/system.action.node_promote_action.yml b/core/modules/node/config/install/system.action.node_promote_action.yml
index b1b4f05..4b3a9ae 100644
--- a/core/modules/node/config/install/system.action.node_promote_action.yml
+++ b/core/modules/node/config/install/system.action.node_promote_action.yml
@@ -4,3 +4,6 @@ status: true
 langcode: en
 type: node
 plugin: node_promote_action
+dependencies:
+  module:
+    - node
diff --git a/core/modules/node/config/install/system.action.node_publish_action.yml b/core/modules/node/config/install/system.action.node_publish_action.yml
index e882bf3..af0b82c 100644
--- a/core/modules/node/config/install/system.action.node_publish_action.yml
+++ b/core/modules/node/config/install/system.action.node_publish_action.yml
@@ -4,3 +4,6 @@ status: true
 langcode: en
 type: node
 plugin: node_publish_action
+dependencies:
+  module:
+    - node
diff --git a/core/modules/node/src/Entity/NodeType.php b/core/modules/node/src/Entity/NodeType.php
index 238ae8f..2d8ac15 100644
--- a/core/modules/node/src/Entity/NodeType.php
+++ b/core/modules/node/src/Entity/NodeType.php
@@ -37,6 +37,15 @@
  *     "edit-form" = "/admin/structure/types/manage/{node_type}",
  *     "delete-form" = "/admin/structure/types/manage/{node_type}/delete",
  *     "collection" = "/admin/structure/types",
+ *   },
+ *   config_export = {
+ *     "name",
+ *     "type",
+ *     "description",
+ *     "help",
+ *     "new_revision",
+ *     "preview_mode",
+ *     "display_submitted",
  *   }
  * )
  */
diff --git a/core/modules/options/src/Plugin/Field/FieldType/ListFloatItem.php b/core/modules/options/src/Plugin/Field/FieldType/ListFloatItem.php
index 8fd6e29..9ce7cb0 100644
--- a/core/modules/options/src/Plugin/Field/FieldType/ListFloatItem.php
+++ b/core/modules/options/src/Plugin/Field/FieldType/ListFloatItem.php
@@ -110,4 +110,11 @@ public static function simplifyAllowedValues(array $structured_values) {
     return $values;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected static function castAllowedValue($value) {
+    return (float) $value;
+  }
+
 }
diff --git a/core/modules/options/src/Plugin/Field/FieldType/ListIntegerItem.php b/core/modules/options/src/Plugin/Field/FieldType/ListIntegerItem.php
index 5992386..2ded4ca 100644
--- a/core/modules/options/src/Plugin/Field/FieldType/ListIntegerItem.php
+++ b/core/modules/options/src/Plugin/Field/FieldType/ListIntegerItem.php
@@ -73,4 +73,11 @@ protected static function validateAllowedValue($option) {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected static function castAllowedValue($value) {
+    return (int) $value;
+  }
+
 }
diff --git a/core/modules/options/src/Plugin/Field/FieldType/ListItemBase.php b/core/modules/options/src/Plugin/Field/FieldType/ListItemBase.php
index bdf063a..9b785d8 100644
--- a/core/modules/options/src/Plugin/Field/FieldType/ListItemBase.php
+++ b/core/modules/options/src/Plugin/Field/FieldType/ListItemBase.php
@@ -314,11 +314,24 @@ protected static function structureAllowedValues(array $values) {
         $label = static::structureAllowedValues($label);
       }
       $structured_values[] = array(
-        'value' => $value,
+        'value' => static::castAllowedValue($value),
         'label' => $label,
       );
     }
     return $structured_values;
   }
 
+  /**
+   * Converts a value to the correct type.
+   *
+   * @param mixed $value
+   *   The value to cast.
+   *
+   * @return mixed
+   *   The casted value.
+   */
+  protected static function castAllowedValue($value) {
+    return $value;
+  }
+
 }
diff --git a/core/modules/options/src/Plugin/Field/FieldType/ListStringItem.php b/core/modules/options/src/Plugin/Field/FieldType/ListStringItem.php
index f3bf401..da30810 100644
--- a/core/modules/options/src/Plugin/Field/FieldType/ListStringItem.php
+++ b/core/modules/options/src/Plugin/Field/FieldType/ListStringItem.php
@@ -75,4 +75,11 @@ protected static function validateAllowedValue($option) {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected static function castAllowedValue($value) {
+    return (string) $value;
+  }
+
 }
diff --git a/core/modules/options/tests/options_config_install_test/config/install/field.storage.node.field_options_float.yml b/core/modules/options/tests/options_config_install_test/config/install/field.storage.node.field_options_float.yml
index f355b2e..1d02c61 100644
--- a/core/modules/options/tests/options_config_install_test/config/install/field.storage.node.field_options_float.yml
+++ b/core/modules/options/tests/options_config_install_test/config/install/field.storage.node.field_options_float.yml
@@ -11,7 +11,7 @@ type: list_float
 settings:
   allowed_values:
     -
-      value: 0
+      value: !!float 0
       label: Zero
     -
       value: 0.5
diff --git a/core/modules/rdf/src/Entity/RdfMapping.php b/core/modules/rdf/src/Entity/RdfMapping.php
index 577cbe7..0a32009 100644
--- a/core/modules/rdf/src/Entity/RdfMapping.php
+++ b/core/modules/rdf/src/Entity/RdfMapping.php
@@ -20,6 +20,13 @@
  *   config_prefix = "mapping",
  *   entity_keys = {
  *     "id" = "id"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "targetEntityType",
+ *     "bundle",
+ *     "types",
+ *     "fieldMappings",
  *   }
  * )
  */
diff --git a/core/modules/search/src/Entity/SearchPage.php b/core/modules/search/src/Entity/SearchPage.php
index 0f583c7..fcce23d 100644
--- a/core/modules/search/src/Entity/SearchPage.php
+++ b/core/modules/search/src/Entity/SearchPage.php
@@ -47,6 +47,14 @@
  *     "label" = "label",
  *     "weight" = "weight",
  *     "status" = "status"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "path",
+ *     "weight",
+ *     "plugin",
+ *     "configuration",
  *   }
  * )
  */
diff --git a/core/modules/shortcut/shortcut.install b/core/modules/shortcut/shortcut.install
index c1a6883..b046142 100644
--- a/core/modules/shortcut/shortcut.install
+++ b/core/modules/shortcut/shortcut.install
@@ -53,7 +53,7 @@ function shortcut_install() {
   // Theme settings are not configuration entities and cannot depend on modules
   // so to set a module-specific setting, we need to set it with logic.
   if (\Drupal::service('theme_handler')->themeExists('seven')) {
-    \Drupal::configFactory()->getEditable('seven.settings')->set('third_party_settings.shortcut.module_link', TRUE)->save();
+    \Drupal::configFactory()->getEditable('seven.settings')->set('third_party_settings.shortcut.module_link', TRUE)->save(TRUE);
   }
 }
 
@@ -64,6 +64,6 @@ function shortcut_uninstall() {
   // Theme settings are not configuration entities and cannot depend on modules
   // so to unset a module-specific setting, we need to unset it with logic.
   if (\Drupal::service('theme_handler')->themeExists('seven')) {
-    \Drupal::configFactory()->getEditable('seven.settings')->clear('third_party_settings.shortcut.module_link')->save();
+    \Drupal::configFactory()->getEditable('seven.settings')->clear('third_party_settings.shortcut.module_link')->save(TRUE);
   }
 }
diff --git a/core/modules/shortcut/shortcut.module b/core/modules/shortcut/shortcut.module
index af62bac..abab6ce 100644
--- a/core/modules/shortcut/shortcut.module
+++ b/core/modules/shortcut/shortcut.module
@@ -415,7 +415,7 @@ function shortcut_themes_installed($theme_list) {
     // Theme settings are not configuration entities and cannot depend on modules
     // so to set a module-specific setting, we need to set it with logic.
     if (\Drupal::moduleHandler()->moduleExists('shortcut')) {
-      \Drupal::configFactory()->getEditable('seven.settings')->set('third_party_settings.shortcut.module_link', TRUE)->save();
+      \Drupal::configFactory()->getEditable('seven.settings')->set('third_party_settings.shortcut.module_link', TRUE)->save(TRUE);
     }
   }
 }
diff --git a/core/modules/shortcut/src/Entity/ShortcutSet.php b/core/modules/shortcut/src/Entity/ShortcutSet.php
index 692e3ab..52e3ecc 100644
--- a/core/modules/shortcut/src/Entity/ShortcutSet.php
+++ b/core/modules/shortcut/src/Entity/ShortcutSet.php
@@ -40,6 +40,10 @@
  *     "delete-form" = "/admin/config/user-interface/shortcut/manage/{shortcut_set}/delete",
  *     "edit-form" = "/admin/config/user-interface/shortcut/manage/{shortcut_set}",
  *     "collection" = "/admin/config/user-interface/shortcut",
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
  *   }
  * )
  */
diff --git a/core/modules/system/src/Entity/Action.php b/core/modules/system/src/Entity/Action.php
index ca3d8cf..b5a0f19 100644
--- a/core/modules/system/src/Entity/Action.php
+++ b/core/modules/system/src/Entity/Action.php
@@ -24,6 +24,13 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "type",
+ *     "plugin",
+ *     "configuration",
  *   }
  * )
  */
diff --git a/core/modules/system/src/Entity/Menu.php b/core/modules/system/src/Entity/Menu.php
index bf5d77d..fa738f3 100644
--- a/core/modules/system/src/Entity/Menu.php
+++ b/core/modules/system/src/Entity/Menu.php
@@ -24,6 +24,12 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "description",
+ *     "locked",
  *   }
  * )
  */
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index f1e6612..082bbc6 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -665,7 +665,7 @@ function system_install() {
   if (!$site->get('name')) {
     $site->set('name', 'Drupal');
   }
-  $site->save();
+  $site->save(TRUE);
 }
 
 /**
diff --git a/core/modules/system/tests/themes/test_basetheme/config/install/core.date_format.fancy.yml b/core/modules/system/tests/themes/test_basetheme/config/install/core.date_format.fancy.yml
index 05d5e27..fc76e73 100644
--- a/core/modules/system/tests/themes/test_basetheme/config/install/core.date_format.fancy.yml
+++ b/core/modules/system/tests/themes/test_basetheme/config/install/core.date_format.fancy.yml
@@ -8,6 +8,8 @@ langcode: en
 locked: false
 pattern: 'U'
 dependencies:
+  theme:
+    - test_basetheme
   enforced:
     theme:
       - test_basetheme
diff --git a/core/modules/taxonomy/src/Entity/Vocabulary.php b/core/modules/taxonomy/src/Entity/Vocabulary.php
index 7b2def3..2855c65 100644
--- a/core/modules/taxonomy/src/Entity/Vocabulary.php
+++ b/core/modules/taxonomy/src/Entity/Vocabulary.php
@@ -41,6 +41,13 @@
  *     "overview-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}/overview",
  *     "edit-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}",
  *     "collection" = "/admin/structure/taxonomy",
+ *   },
+ *   config_export = {
+ *     "name",
+ *     "vid",
+ *     "description",
+ *     "hierarchy",
+ *     "weight",
  *   }
  * )
  */
diff --git a/core/modules/tour/src/Entity/Tour.php b/core/modules/tour/src/Entity/Tour.php
index d50caa9..15357e0 100644
--- a/core/modules/tour/src/Entity/Tour.php
+++ b/core/modules/tour/src/Entity/Tour.php
@@ -24,6 +24,13 @@
  *   entity_keys = {
  *     "id" = "id",
  *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "module",
+ *     "routes",
+ *     "tips",
  *   }
  * )
  */
diff --git a/core/modules/user/config/optional/views.view.user_admin_people.yml b/core/modules/user/config/optional/views.view.user_admin_people.yml
index 8be9b7e..004471c 100644
--- a/core/modules/user/config/optional/views.view.user_admin_people.yml
+++ b/core/modules/user/config/optional/views.view.user_admin_people.yml
@@ -567,7 +567,7 @@ display:
           delta_first_last: false
           multi_type: separator
           separator: ', '
-          field_api_classes: 0
+          field_api_classes: false
           plugin_id: field
           entity_type: user
           entity_field: mail
diff --git a/core/modules/user/src/Entity/Role.php b/core/modules/user/src/Entity/Role.php
index 9216ad8..b997e69 100644
--- a/core/modules/user/src/Entity/Role.php
+++ b/core/modules/user/src/Entity/Role.php
@@ -40,6 +40,13 @@
  *     "edit-form" = "/admin/people/roles/manage/{user_role}",
  *     "edit-permissions-form" = "/admin/people/permissions/{user_role}",
  *     "collection" = "/admin/people/roles",
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "weight",
+ *     "is_admin",
+ *     "permissions",
  *   }
  * )
  */
diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 07c84d0..5ad2876 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -982,7 +982,7 @@ function user_user_role_insert(RoleInterface $role) {
       ),
       'plugin' => 'user_add_role_action',
     ));
-    $action->save();
+    $action->trustData()->save();
   }
   $remove_id = 'user_remove_role_action.' . $role->id();
   if (!entity_load('action', $remove_id)) {
@@ -995,7 +995,7 @@ function user_user_role_insert(RoleInterface $role) {
       ),
       'plugin' => 'user_remove_role_action',
     ));
-    $action->save();
+    $action->trustData()->save();
   }
 }
 
@@ -1140,7 +1140,7 @@ function user_role_grant_permissions($rid, array $permissions = array()) {
     foreach ($permissions as $permission) {
       $role->grantPermission($permission);
     }
-    $role->save();
+    $role->trustData()->save();
   }
 }
 
@@ -1161,7 +1161,7 @@ function user_role_revoke_permissions($rid, array $permissions = array()) {
   foreach ($permissions as $permission) {
     $role->revokePermission($permission);
   }
-  $role->save();
+  $role->trustData()->save();
 }
 
 /**
diff --git a/core/modules/views/src/Entity/View.php b/core/modules/views/src/Entity/View.php
index 34b4ab0..b7188c5 100644
--- a/core/modules/views/src/Entity/View.php
+++ b/core/modules/views/src/Entity/View.php
@@ -29,6 +29,17 @@
  *     "id" = "id",
  *     "label" = "label",
  *     "status" = "status"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "label",
+ *     "module",
+ *     "description",
+ *     "tag",
+ *     "base_table",
+ *     "base_field",
+ *     "core",
+ *     "display",
  *   }
  * )
  */
diff --git a/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php b/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
index a45d39a..d683426 100644
--- a/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
+++ b/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
@@ -2293,7 +2293,7 @@ public function calculateCacheMetadata () {
       $cache_plugin->alterCacheMetadata($is_cacheable, $cache_contexts);
     }
 
-    return [$is_cacheable, $cache_contexts];
+    return [(bool) $is_cacheable, $cache_contexts];
   }
 
   /**
diff --git a/core/modules/views_ui/src/ViewUI.php b/core/modules/views_ui/src/ViewUI.php
index 8b5569e..75bbbdf 100644
--- a/core/modules/views_ui/src/ViewUI.php
+++ b/core/modules/views_ui/src/ViewUI.php
@@ -1285,4 +1285,18 @@ public function getThirdPartyProviders() {
     return $this->storage->getThirdPartyProviders();
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function trustData() {
+    return $this->storage->trustData();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasTrustedData() {
+    return $this->storage->hasTrustedData();
+  }
+
 }
diff --git a/core/profiles/minimal/minimal.install b/core/profiles/minimal/minimal.install
index a8baf07..d30cb3b 100644
--- a/core/profiles/minimal/minimal.install
+++ b/core/profiles/minimal/minimal.install
@@ -13,8 +13,8 @@
  */
 function minimal_install() {
   // Disable the user pictures on nodes.
-  \Drupal::configFactory()->getEditable('system.theme.global')->set('features.node_user_picture', FALSE)->save();
+  \Drupal::configFactory()->getEditable('system.theme.global')->set('features.node_user_picture', FALSE)->save(TRUE);
 
   // Allow visitor account creation, but with administrative approval.
-  \Drupal::configFactory()->getEditable('user.settings')->set('register', USER_REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL)->save();
+  \Drupal::configFactory()->getEditable('user.settings')->set('register', USER_REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL)->save(TRUE);
 }
diff --git a/core/profiles/standard/standard.install b/core/profiles/standard/standard.install
index b5e2b63..000ffa4 100644
--- a/core/profiles/standard/standard.install
+++ b/core/profiles/standard/standard.install
@@ -23,11 +23,11 @@ function standard_install() {
   \Drupal::service('entity.definition_update_manager')->applyUpdates();
 
   // Set front page to "node".
-  \Drupal::configFactory()->getEditable('system.site')->set('page.front', 'node')->save();
+  \Drupal::configFactory()->getEditable('system.site')->set('page.front', 'node')->save(TRUE);
 
   // Allow visitor account creation with administrative approval.
   $user_settings = \Drupal::configFactory()->getEditable('user.settings');
-  $user_settings->set('register', USER_REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL)->save();
+  $user_settings->set('register', USER_REGISTER_VISITORS_ADMINISTRATIVE_APPROVAL)->save(TRUE);
 
   // Enable default permissions for system roles.
   user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, array('access comments'));
@@ -41,7 +41,7 @@ function standard_install() {
   // Enable the Contact link in the footer menu.
   /** @var \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager */
   $menu_link_manager = \Drupal::service('plugin.manager.menu.link');
-  $menu_link_manager->updateDefinition('contact.site_page', array('enabled' => 1));
+  $menu_link_manager->updateDefinition('contact.site_page', array('enabled' => TRUE));
 
   user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, array('access site-wide contact form'));
   user_role_grant_permissions(RoleInterface::AUTHENTICATED_ID, array('access site-wide contact form'));
@@ -67,5 +67,5 @@ function standard_install() {
   $shortcut->save();
 
   // Enable the admin theme.
-  \Drupal::configFactory()->getEditable('node.settings')->set('use_admin_theme', '1')->save();
+  \Drupal::configFactory()->getEditable('node.settings')->set('use_admin_theme', TRUE)->save(TRUE);
 }
diff --git a/core/profiles/standard/standard.profile b/core/profiles/standard/standard.profile
index ad69906..030b92a 100644
--- a/core/profiles/standard/standard.profile
+++ b/core/profiles/standard/standard.profile
@@ -23,5 +23,5 @@ function standard_form_install_configure_form_alter(&$form, FormStateInterface $
  */
 function standard_form_install_configure_submit($form, FormStateInterface $form_state) {
   $site_mail = $form_state->getValue('site_mail');
-  ContactForm::load('feedback')->setRecipients([$site_mail])->save();
+  ContactForm::load('feedback')->setRecipients([$site_mail])->trustData()->save();
 }
diff --git a/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override.yml b/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override.yml
index 4a54a33..e0d67e0 100644
--- a/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override.yml
+++ b/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override.yml
@@ -2,7 +2,7 @@ id: override
 label: Override
 weight: 0
 protected_property: Default
-status: 1
+status: true
 dependencies:
   module:
     - tour
diff --git a/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override_unmet.yml b/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override_unmet.yml
index f20365f..d4e755d 100644
--- a/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override_unmet.yml
+++ b/core/profiles/testing_config_overrides/config/optional/config_test.dynamic.override_unmet.yml
@@ -2,7 +2,7 @@ id: override_unmet
 label: Override
 weight: 0
 protected_property: Default
-status: 1
+status: true
 dependencies:
   module:
     - dblog
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
index a0e043b..5e11828 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
@@ -28,7 +28,7 @@ class ConfigEntityBaseUnitTest extends UnitTestCase {
   /**
    * The entity type used for testing.
    *
-   * @var \Drupal\Core\Entity\EntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
+   * @var \Drupal\Core\Config\Entity\ConfigEntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
    */
   protected $entityType;
 
@@ -463,9 +463,51 @@ public function testSort() {
    * @covers ::toArray
    */
   public function testToArray() {
+    $this->typedConfigManager->expects($this->never())
+      ->method('getDefinition');
+    $this->entityType->expects($this->any())
+      ->method('getPropertiesToExport')
+      ->willReturn(['id' => 'configId', 'dependencies' => 'dependencies']);
+    $properties = $this->entity->toArray();
+    $this->assertInternalType('array', $properties);
+    $this->assertEquals(array('configId' => $this->entity->id(), 'dependencies' => array()), $properties);
+  }
+
+  /**
+   * @covers ::toArray
+   */
+  public function testToArrayIdKey() {
+    $entity = $this->getMockForAbstractClass('\Drupal\Core\Config\Entity\ConfigEntityBase', [[], $this->entityTypeId], '', TRUE, TRUE, TRUE, ['id', 'get']);
+    $entity->expects($this->exactly(3))
+      ->method('id')
+      ->willReturn($this->id);
+    $entity->expects($this->once())
+      ->method('get')
+      ->willReturn([]);
+    $this->typedConfigManager->expects($this->never())
+      ->method('getDefinition');
+    $this->entityType->expects($this->any())
+      ->method('getPropertiesToExport')
+      ->willReturn(['id' => 'configId', 'dependencies' => 'dependencies']);
+    $this->entityType->expects($this->once())
+      ->method('getKey')
+      ->with('id')
+      ->willReturn('id');
+    $properties = $entity->toArray();
+    $this->assertInternalType('array', $properties);
+    $this->assertEquals(['configId' => $entity->id(), 'dependencies' => []], $properties);
+  }
+
+  /**
+   * @covers ::toArray
+   */
+  public function testToArraySchemaFallback() {
     $this->typedConfigManager->expects($this->once())
       ->method('getDefinition')
       ->will($this->returnValue(array('mapping' => array('id' => '', 'dependencies' => ''))));
+    $this->entityType->expects($this->any())
+      ->method('getPropertiesToExport')
+      ->willReturn([]);
     $properties = $this->entity->toArray();
     $this->assertInternalType('array', $properties);
     $this->assertEquals(array('id' => $this->entity->id(), 'dependencies' => array()), $properties);
@@ -477,6 +519,9 @@ public function testToArray() {
    * @expectedException \Drupal\Core\Config\Schema\SchemaIncompleteException
    */
   public function testToArrayFallback() {
+    $this->entityType->expects($this->any())
+      ->method('getPropertiesToExport')
+      ->willReturn([]);
     $this->entity->toArray();
   }
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
index 12096ba..e0083e4 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
@@ -22,7 +22,7 @@ class ConfigEntityStorageTest extends UnitTestCase {
   /**
    * The entity type.
    *
-   * @var \Drupal\Core\Entity\EntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
+   * @var \Drupal\Core\Config\Entity\ConfigEntityTypeInterface|\PHPUnit_Framework_MockObject_MockObject
    */
   protected $entityType;
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php
index b427dfc..524fea0 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityTypeTest.php
@@ -131,4 +131,60 @@ public function providerTestGetConfigPrefix() {
     );
   }
 
+  /**
+   * @covers ::getPropertiesToExport
+   *
+   * @dataProvider providerGetPropertiesToExport
+   */
+  public function testGetPropertiesToExport($definition, $expected) {
+    $entity_type = $this->setUpConfigEntityType($definition);
+    $properties_to_export = $entity_type->getPropertiesToExport();
+    $this->assertSame($expected, $properties_to_export);
+
+    // Ensure the method is idempotent.
+    $properties_to_export = $entity_type->getPropertiesToExport();
+    $this->assertSame($expected, $properties_to_export);
+  }
+
+  public function providerGetPropertiesToExport() {
+    $data = [];
+    $data[] = [
+      [],
+      NULL,
+    ];
+
+    $data[] = [
+      [
+        'config_export' => [
+          'id',
+          'custom_property' => 'customProperty',
+        ],
+      ],
+      [
+        'uuid' => 'uuid',
+        'langcode' => 'langcode',
+        'status' => 'status',
+        'dependencies' => 'dependencies',
+        'third_party_settings' => 'third_party_settings',
+        'id' => 'id',
+        'custom_property' => 'customProperty',
+      ],
+    ];
+
+    $data[] = [
+      [
+        'config_export' => [
+          'id',
+        ],
+        'mergedConfigExport' => [
+          'random_key' => 'random_key',
+        ],
+      ],
+      [
+        'random_key' => 'random_key',
+      ],
+    ];
+    return $data;
+  }
+
 }
diff --git a/core/tests/Drupal/Tests/Core/Menu/StaticMenuLinkOverridesTest.php b/core/tests/Drupal/Tests/Core/Menu/StaticMenuLinkOverridesTest.php
index 3f60933..32d0b3a 100644
--- a/core/tests/Drupal/Tests/Core/Menu/StaticMenuLinkOverridesTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/StaticMenuLinkOverridesTest.php
@@ -114,11 +114,15 @@ public function testSaveOverride() {
       ->with('definitions')
       ->will($this->returnValue(array()));
 
-    $definition_save_1 = array('definitions' => array('test1' => array('parent' => 'test0')));
+    $definition_save_1 = array(
+      'definitions' => array(
+        'test1' => array('parent' => 'test0', 'menu_name' => '', 'weight' => 0, 'expanded' => FALSE, 'enabled' => FALSE)
+      )
+    );
     $definitions_save_2 = array(
       'definitions' => array(
-        'test1' => array('parent' => 'test0'),
-        'test1__la___ma' => array('parent' => 'test1')
+        'test1' => array('parent' => 'test0', 'menu_name' => '', 'weight' => 0, 'expanded' => FALSE, 'enabled' => FALSE),
+        'test1__la___ma' => array('parent' => 'test1', 'menu_name' => '', 'weight' => 0, 'expanded' => FALSE, 'enabled' => FALSE)
       )
     );
     $config->expects($this->at(2))