diff --git a/core/config/schema/core.data_types.schema.yml b/core/config/schema/core.data_types.schema.yml
index 0e589e1..ef68a3e 100644
--- a/core/config/schema/core.data_types.schema.yml
+++ b/core/config/schema/core.data_types.schema.yml
@@ -414,14 +414,19 @@ core.date_format.*:
       type: string
       label: 'Default language'
 
-# Schema for the String field type.
+# Schema for the configuration of the String field type.
+
+field.string.storage_settings:
+  type: mapping
+  label: 'String settings'
+  mapping:
+    max_length:
+      type: integer
+      label: 'Maximum length'
 
 field.string.field_settings:
   type: sequence
   label: 'String settings'
-  sequence:
-    - type: string
-      label: 'Setting'
 
 field.string.value:
   type: sequence
@@ -434,7 +439,127 @@ field.string.value:
           type: string
           label: 'Value'
 
-# Schema for the configuration files of the Boolean field type.
+# Schema for the configuration of the  String (long) field type.
+
+field.string_long.storage_settings:
+  type: field.string.storage_settings
+  label: 'String (long) settings'
+
+field.string_long.field_settings:
+  type: field.string.field_settings
+  label: 'String (long) settings'
+
+field.string_long.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: text
+          label: 'Value'
+
+# Schema for the configuration of the URI field type.
+
+field.uri.storage_settings:
+  type: mapping
+  label: 'URI settings'
+  mapping:
+    max_length:
+      type: integer
+      label: 'Maximum length'
+
+field.uri.field_settings:
+  type: sequence
+  label: 'URI settings'
+
+field.uri.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: string
+          label: 'Value'
+
+# Schema for the configuration of the Created field type.
+
+field.created.storage_settings:
+  type: sequence
+  label: 'Created timestamp settings'
+
+field.created.field_settings:
+  type: sequence
+  label: 'Created timestamp settings'
+
+field.created.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: integer
+          label: 'Value'
+
+# Schema for the configuration of the Changed field type.
+
+field.changed.storage_settings:
+  type: sequence
+  label: 'Changed timestamp settings'
+
+field.changed.field_settings:
+  type: sequence
+  label: 'Changed timestamp settings'
+
+field.changed.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: integer
+          label: 'Value'
+
+# Schema for the configuration of the Entity reference field type.
+
+field.entity_reference.storage_settings:
+  type: mapping
+  label: 'Entity reference settings'
+  mapping:
+    target_type:
+      type: string
+      label: 'Type of item to reference'
+
+field.entity_reference.field_settings:
+  type: mapping
+  label: 'Entity reference settings'
+  mapping:
+    handler:
+      type: string
+      label: 'Reference method'
+    handler_settings:
+      type: entity_reference.[%parent.handler].handler_settings
+      label: 'Reference method settings'
+
+field.entity_reference.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        target_id:
+          type: integer
+          label: 'Value'
+
+# Schema for the configuration of the Boolean field type.
 
 field.boolean.storage_settings:
   type: mapping
@@ -449,8 +574,7 @@ field.boolean.storage_settings:
 
 field.boolean.field_settings:
   label: 'Boolean settings'
-  type: mapping
-  mapping: {  }
+  type: sequence
 
 field.boolean.value:
   type: sequence
@@ -463,7 +587,7 @@ field.boolean.value:
           type: integer
           label: 'Value'
 
-# Schema for the configuration files of the Email field type.
+# Schema for the configuration of the Email field type.
 
 field.email.storage_settings:
   type: sequence
@@ -489,7 +613,7 @@ field.email.value:
           type: email
           label: 'Value'
 
-# Schema for configuration files of a numeric field types.
+# Schema for the configuration of the Integer field type.
 
 field.integer.storage_settings:
   type: sequence
@@ -526,6 +650,8 @@ field.integer.value:
           type: integer
           label: 'Value'
 
+# Schema for the configuration of the Decimal field type.
+
 field.decimal.storage_settings:
   type: mapping
   label: 'Decimal settings'
@@ -565,6 +691,8 @@ field.decimal.value:
            type: float
            label: 'Value'
 
+# Schema for the configuration of the Float field type.
+
 field.float.storage_settings:
   type: sequence
   label: 'Float settings'
diff --git a/core/lib/Drupal/Core/Field/BaseFieldDefinition.php b/core/lib/Drupal/Core/Field/BaseFieldDefinition.php
index 9b04e9c..b127a229 100644
--- a/core/lib/Drupal/Core/Field/BaseFieldDefinition.php
+++ b/core/lib/Drupal/Core/Field/BaseFieldDefinition.php
@@ -443,6 +443,12 @@ public function setDefaultValueCallback($callback) {
    * @return $this
    */
   public function setDefaultValue($value) {
+    if (!is_array($value)) {
+      $value = array(array($this->getMainPropertyName() => $value));
+    }
+    elseif (!is_numeric(array_keys($value)[0])) {
+      $value = array(0 => $value);
+    }
     $this->definition['default_value'] = $value;
     return $this;
   }
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
index 98ea255..ea28195 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\content_translation\Tests;
 
 use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
+use Drupal\config\Tests\SchemaCheckTestTrait;
 use Drupal\Core\Field\Entity\BaseFieldOverride;
 use Drupal\Core\Language\Language;
 use Drupal\field\Entity\FieldConfig;
@@ -20,6 +21,8 @@
  */
 class ContentTranslationSettingsTest extends WebTestBase {
 
+  use SchemaCheckTestTrait;
+
   /**
    * Modules to enable.
    *
@@ -178,6 +181,8 @@ function testSettingsUI() {
       $this->assertEqual($definitions['body']->isTranslatable(), $translatable, 'Field translatability correctly switched.');
       $this->assertEqual($field->isTranslatable(), $definitions['body']->isTranslatable(), 'Configurable field translatability correctly switched.');
     }
+
+    $this->assertConfigSchemas();
   }
 
   /**
@@ -269,4 +274,22 @@ protected function entityManager() {
     return $this->container->get('entity.manager');
   }
 
+  /**
+   * Asserts all active configuration matches schemas.
+   */
+  protected function assertConfigSchemas() {
+    $names = $this->container->get('config.storage')->listAll();
+    $factory = $this->container->get('config.factory');
+    /** @var \Drupal\Core\Config\TypedConfigManagerInterface $typed_config */
+    $typed_config = $this->container->get('config.typed');
+    foreach ($names as $name) {
+      // It is not possible to provide schema due to https://www.drupal.org/node/2248709
+      // @todo Refactor settings in https://www.drupal.org/node/2363155
+      if ($name != 'content_translation.settings') {
+        $config = $factory->get($name);
+        $this->assertConfigSchema($typed_config, $name, $config->get());
+      }
+    }
+  }
+
 }
diff --git a/core/modules/entity_reference/config/schema/entity_reference.schema.yml b/core/modules/entity_reference/config/schema/entity_reference.schema.yml
index de96443..5404963 100644
--- a/core/modules/entity_reference/config/schema/entity_reference.schema.yml
+++ b/core/modules/entity_reference/config/schema/entity_reference.schema.yml
@@ -1,35 +1,5 @@
 # Schema for the configuration files of the Entity Reference module.
 
-field.entity_reference.storage_settings:
-  type: mapping
-  label: 'Entity reference settings'
-  mapping:
-    target_type:
-      type: string
-      label: 'Type of item to reference'
-
-field.entity_reference.field_settings:
-  type: mapping
-  label: 'Entity reference settings'
-  mapping:
-    handler:
-      type: string
-      label: 'Reference method'
-    handler_settings:
-      type: entity_reference.[%parent.handler].handler_settings
-      label: 'Reference method settings'
-
-field.entity_reference.value:
-  type: sequence
-  label: 'Default value'
-  sequence:
-    - type: mapping
-      label: 'Default'
-      mapping:
-        target_id:
-          type: integer
-          label: 'Value'
-
 entity_reference.default.handler_settings:
   type: mapping
   label: 'View handler settings'
diff --git a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php
index b4cb26e..ace4815 100644
--- a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php
+++ b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php
@@ -107,7 +107,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setSetting('handler', 'default')
       // Default EntityTest entities to have the root user as the owner, to
       // simplify testing.
-      ->setDefaultValue(array(0 => 1))
+      ->setDefaultValue(1)
       ->setTranslatable(TRUE)
       ->setDisplayOptions('form', array(
         'type' => 'entity_reference_autocomplete',
diff --git a/core/tests/Drupal/Tests/Core/Entity/BaseFieldDefinitionTest.php b/core/tests/Drupal/Tests/Core/Entity/BaseFieldDefinitionTest.php
index bc88b21..ae71170 100644
--- a/core/tests/Drupal/Tests/Core/Entity/BaseFieldDefinitionTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/BaseFieldDefinitionTest.php
@@ -164,6 +164,7 @@ public function testFieldDefaultValue() {
     $default_value = array(
       'value' => $this->randomMachineName(),
     );
+    $expected_default_value = array($default_value);
     $definition->setDefaultValue($default_value);
     $entity = $this->getMockBuilder('Drupal\Core\Entity\ContentEntityBase')
       ->disableOriginalConstructor()
@@ -171,7 +172,23 @@ public function testFieldDefaultValue() {
     // Set the field item list class to be used to avoid requiring the typed
     // data manager to retrieve it.
     $definition->setClass('Drupal\Core\Field\FieldItemList');
-    $this->assertEquals($default_value, $definition->getDefaultValue($entity));
+    $this->assertEquals($expected_default_value, $definition->getDefaultValue($entity));
+
+    $data_definition = $this->getMockBuilder('Drupal\Core\TypedData\DataDefinition')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $data_definition->expects($this->any())
+      ->method('getClass')
+      ->will($this->returnValue('Drupal\Core\Field\FieldItemBase'));
+    $definition->setItemDefinition($data_definition);
+
+    // Set default value only with a literal.
+    $definition->setDefaultValue($default_value['value']);
+    $this->assertEquals($expected_default_value, $definition->getDefaultValue($entity));
+
+    // Set default value with an indexed array.
+    $definition->setDefaultValue($expected_default_value);
+    $this->assertEquals($expected_default_value, $definition->getDefaultValue($entity));
   }
 
   /**