diff --git a/core/modules/field/field.api.php b/core/modules/field/field.api.php
index 095c28d..7ef76f5 100644
--- a/core/modules/field/field.api.php
+++ b/core/modules/field/field.api.php
@@ -35,11 +35,11 @@
  *   - weight: The default weight of the element.
  *   - visible: The default visibility of the element. Only for 'display'
  *     context.
- *   - edit: (optional) String containing markup (normally a link) used as the 
- *     element's 'edit' operation in the administration interface. Only for 
+ *   - edit: (optional) String containing markup (normally a link) used as the
+ *     element's 'edit' operation in the administration interface. Only for
  *     'form' context.
- *   - delete: (optional) String containing markup (normally a link) used as the 
- *     element's 'delete' operation in the administration interface. Only for 
+ *   - delete: (optional) String containing markup (normally a link) used as the
+ *     element's 'delete' operation in the administration interface. Only for
  *     'form' context.
  */
 function hook_field_extra_fields() {
@@ -1652,7 +1652,7 @@ function hook_field_storage_create_field($field) {
  */
 function hook_field_storage_delete_field($field) {
   // Mark all data associated with the field for deletion.
-  $field['deleted'] = 0;
+  $field['deleted'] = FALSE;
   $table = _field_sql_storage_tablename($field);
   $revision_table = _field_sql_storage_revision_tablename($field);
   db_update($table)
@@ -1660,7 +1660,7 @@ function hook_field_storage_delete_field($field) {
     ->execute();
 
   // Move the table to a unique name while the table contents are being deleted.
-  $field['deleted'] = 1;
+  $field['deleted'] = TRUE;
   $new_table = _field_sql_storage_tablename($field);
   $revision_new_table = _field_sql_storage_revision_tablename($field);
   db_rename_table($table, $new_table);
diff --git a/core/modules/field/field.attach.inc b/core/modules/field/field.attach.inc
index 9b24d94..fa694ff 100644
--- a/core/modules/field/field.attach.inc
+++ b/core/modules/field/field.attach.inc
@@ -1565,7 +1565,7 @@ function field_entity_bundle_delete($entity_type, $bundle) {
   // Get the instances on the bundle. field_read_instances() must be used
   // here since field_info_instances() does not return instances for disabled
   // entity types or bundles.
-  $instances = field_read_instances(array('entity_type' => $entity_type, 'bundle' => $bundle), array('include_inactive' => 1));
+  $instances = field_read_instances(array('entity_type' => $entity_type, 'bundle' => $bundle), array('include_inactive' => TRUE));
   foreach ($instances as $instance) {
     field_delete_instance($instance);
   }
diff --git a/core/modules/field/field.crud.inc b/core/modules/field/field.crud.inc
index 3138b00..8422600 100644
--- a/core/modules/field/field.crud.inc
+++ b/core/modules/field/field.crud.inc
@@ -169,8 +169,8 @@ function field_read_fields($conditions = array(), $include_additional = array())
 
   // Translate "do not include inactive instances" into actual conditions.
   if (!$include_inactive) {
-    $conditions['active'] = 1;
-    $conditions['storage.active'] = 1;
+    $conditions['active'] = TRUE;
+    $conditions['storage.active'] = TRUE;
   }
 
   // Collect matching fields.
@@ -360,8 +360,8 @@ function field_read_instances($conditions = array(), $include_additional = array
 
   // Translate "do not include inactive fields" into actual conditions.
   if (!$include_inactive) {
-    $conditions['field.active'] = 1;
-    $conditions['field.storage.active'] = 1;
+    $conditions['field.active'] = TRUE;
+    $conditions['field.storage.active'] = TRUE;
   }
 
   // Collect matching instances.
@@ -520,7 +520,7 @@ function field_delete_instance(FieldInstance $instance, $field_cleanup = TRUE) {
 function field_purge_batch($batch_size) {
   // Retrieve all deleted field instances. We cannot use field_info_instances()
   // because that function does not return deleted instances.
-  $instances = field_read_instances(array('deleted' => 1), array('include_deleted' => 1));
+  $instances = field_read_instances(array('deleted' => TRUE), array('include_deleted' => TRUE));
   $factory = Drupal::service('entity.query');
   $info = entity_get_info();
   foreach ($instances as $instance) {
diff --git a/core/modules/field/field.install b/core/modules/field/field.install
index c1a1378..663ae69 100644
--- a/core/modules/field/field.install
+++ b/core/modules/field/field.install
@@ -32,8 +32,8 @@ function _update_7000_field_create_field(&$field) {
     'locked' => FALSE,
     'settings' => array(),
     'indexes' => array(),
-    'deleted' => 0,
-    'active' => 1,
+    'deleted' => FALSE,
+    'active' => TRUE,
   );
 
   // Set storage.
@@ -41,7 +41,7 @@ function _update_7000_field_create_field(&$field) {
     'type' => 'field_sql_storage',
     'settings' => array(),
     'module' => 'field_sql_storage',
-    'active' => 1,
+    'active' => TRUE,
   );
 
   // Fetch the field schema to initialize columns and indexes. The field module
@@ -208,7 +208,7 @@ function _update_7000_field_create_instance($field, &$instance) {
   $instance += array(
     'field_id' => $field['id'],
     'field_name' => $field['field_name'],
-    'deleted' => 0,
+    'deleted' => FALSE,
     'description' => '',
     'required' => FALSE,
   );
diff --git a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php
index fe6886a..18a35cb 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php
@@ -235,7 +235,7 @@ public function __construct(array $values, $entity_type = 'field_entity') {
       'translatable' => FALSE,
       'entity_types' => array(),
       'locked' => FALSE,
-      'deleted' => 0,
+      'deleted' => FALSE,
       'storage' => array(),
       'indexes' => array(),
     );
@@ -315,7 +315,7 @@ public function save() {
         throw new FieldException(format_string('Attempt to create a field of unknown type %type.', array('%type' => $this->type)));
       }
       $this->module = $field_type['module'];
-      $this->active = 1;
+      $this->active = TRUE;
 
       // Make sure all settings are present, so that a complete field
       // definition is passed to the various hooks and written to config.
@@ -332,7 +332,7 @@ public function save() {
         throw new FieldException(format_string('Attempt to create a field with unknown storage type %type.', array('%type' => $this->storage['type'])));
       }
       $this->storage['module'] = $storage_type['module'];
-      $this->storage['active'] = 1;
+      $this->storage['active'] = TRUE;
       // Provide default storage settings.
       $this->storage['settings'] += $storage_type['settings'];
 
diff --git a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php
index 9db2f3d..24e3df4 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/FieldInstance.php
@@ -273,7 +273,7 @@ public function __construct(array $values, $entity_type = 'field_instance') {
       'default_value_function' => '',
       'settings' => array(),
       'widget' => array(),
-      'deleted' => 0,
+      'deleted' => FALSE,
     );
     parent::__construct($values, $entity_type);
   }
diff --git a/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php b/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
index f4b564f..c288750 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
@@ -451,7 +451,7 @@ function fakeFieldInstance($formatter, $formatter_settings) {
       'required' => FALSE,
       'label' => $field_name,
       'description' => '',
-      'deleted' => 0,
+      'deleted' => FALSE,
     );
   }
 
diff --git a/core/modules/field/lib/Drupal/field/Tests/BulkDeleteTest.php b/core/modules/field/lib/Drupal/field/Tests/BulkDeleteTest.php
index 9b03174..ca414bc 100644
--- a/core/modules/field/lib/Drupal/field/Tests/BulkDeleteTest.php
+++ b/core/modules/field/lib/Drupal/field/Tests/BulkDeleteTest.php
@@ -166,7 +166,7 @@ function testDeleteFieldInstance() {
     field_delete_instance($instance);
 
     // The instance still exists, deleted.
-    $instances = field_read_instances(array('field_id' => $field['uuid'], 'deleted' => 1), array('include_deleted' => 1, 'include_inactive' => 1));
+    $instances = field_read_instances(array('field_id' => $field['uuid'], 'deleted' => TRUE), array('include_deleted' => TRUE, 'include_inactive' => TRUE));
     $this->assertEqual(count($instances), 1, 'There is one deleted instance');
     $this->assertEqual($instances[0]['bundle'], $bundle, 'The deleted instance is for the correct bundle');
 
@@ -193,7 +193,7 @@ function testDeleteFieldInstance() {
       $ids->entity_id = $entity_id;
       $entities[$entity_id] = _field_create_entity_from_ids($ids);
     }
-    field_attach_load($this->entity_type, $entities, FIELD_LOAD_CURRENT, array('field_id' => $field['uuid'], 'deleted' => 1));
+    field_attach_load($this->entity_type, $entities, FIELD_LOAD_CURRENT, array('field_id' => $field['uuid'], 'deleted' => TRUE));
     $this->assertEqual(count($found), 10, 'Correct number of entities found after deleting');
     foreach ($entities as $id => $entity) {
       $this->assertEqual($this->entities[$id]->{$field['field_name']}, $entity->{$field['field_name']}, "Entity $id with deleted data loaded correctly");
@@ -249,18 +249,18 @@ function testPurgeInstance() {
     $this->checkHooksInvocations($hooks, $actual_hooks);
 
     // The instance still exists, deleted.
-    $instances = field_read_instances(array('field_id' => $field['uuid'], 'deleted' => 1), array('include_deleted' => 1, 'include_inactive' => 1));
+    $instances = field_read_instances(array('field_id' => $field['uuid'], 'deleted' => TRUE), array('include_deleted' => TRUE, 'include_inactive' => TRUE));
     $this->assertEqual(count($instances), 1, 'There is one deleted instance');
 
     // Purge the instance.
     field_purge_batch($batch_size);
 
     // The instance is gone.
-    $instances = field_read_instances(array('field_id' => $field['uuid'], 'deleted' => 1), array('include_deleted' => 1, 'include_inactive' => 1));
+    $instances = field_read_instances(array('field_id' => $field['uuid'], 'deleted' => TRUE), array('include_deleted' => TRUE, 'include_inactive' => TRUE));
     $this->assertEqual(count($instances), 0, 'The instance is gone');
 
     // The field still exists, not deleted, because it has a second instance.
-    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => 1, 'include_inactive' => 1));
+    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => TRUE, 'include_inactive' => TRUE));
     $this->assertTrue(isset($fields[$field['uuid']]), 'The field exists and is not deleted');
   }
 
@@ -302,7 +302,7 @@ function testPurgeField() {
     field_purge_batch(0);
 
     // The field still exists, not deleted.
-    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => 1));
+    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => TRUE));
     $this->assertTrue(isset($fields[$field['uuid']]) && !$fields[$field['uuid']]->deleted, 'The field exists and is not deleted');
 
     // Delete the second instance.
@@ -326,14 +326,14 @@ function testPurgeField() {
     $this->checkHooksInvocations($hooks, $actual_hooks);
 
     // The field still exists, deleted.
-    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => 1));
+    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => TRUE));
     $this->assertTrue(isset($fields[$field['uuid']]) && $fields[$field['uuid']]->deleted, 'The field exists and is deleted');
 
     // Purge again to purge the instance and the field.
     field_purge_batch(0);
 
     // The field is gone.
-    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => 1, 'include_inactive' => 1));
+    $fields = field_read_fields(array('uuid' => $field['uuid']), array('include_deleted' => TRUE, 'include_inactive' => TRUE));
     $this->assertEqual(count($fields), 0, 'The field is purged.');
   }
 }
diff --git a/core/modules/field/lib/Drupal/field/Tests/FieldInfoTest.php b/core/modules/field/lib/Drupal/field/Tests/FieldInfoTest.php
index 0ae1dc0..122d14c 100644
--- a/core/modules/field/lib/Drupal/field/Tests/FieldInfoTest.php
+++ b/core/modules/field/lib/Drupal/field/Tests/FieldInfoTest.php
@@ -18,7 +18,7 @@ public static function getInfo() {
   }
 
   /**
-   * Test that field types and field definitions are correcly cached.
+   * Test that field types and field definitions are correctly cached.
    */
   function testFieldInfo() {
     // Test that field_test module's fields, widgets, and formatters show up.
@@ -69,7 +69,7 @@ function testFieldInfo() {
       $this->assertEqual($fields[$field['field_name']]['settings'][$key], $val, format_string('Field setting %key has correct default value %value', array('%key' => $key, '%value' => $val)));
     }
     $this->assertEqual($fields[$field['field_name']]['cardinality'], 1, 'info fields contains cardinality 1');
-    $this->assertEqual($fields[$field['field_name']]['active'], 1, 'info fields contains active 1');
+    $this->assertEqual($fields[$field['field_name']]['active'], TRUE, 'info fields contains active 1');
 
     // Create an instance, verify that it shows up
     $instance = array(
diff --git a/core/modules/field_sql_storage/field_sql_storage.module b/core/modules/field_sql_storage/field_sql_storage.module
index e8afd3c..b4587c2 100644
--- a/core/modules/field_sql_storage/field_sql_storage.module
+++ b/core/modules/field_sql_storage/field_sql_storage.module
@@ -359,7 +359,7 @@ function field_sql_storage_field_storage_update_field($field, $prior_field, $has
  */
 function field_sql_storage_field_storage_delete_field($field) {
   // Mark all data associated with the field for deletion.
-  $field['deleted'] = 0;
+  $field['deleted'] = FALSE;
   $table = _field_sql_storage_tablename($field);
   $revision_table = _field_sql_storage_revision_tablename($field);
   db_update($table)
@@ -367,7 +367,7 @@ function field_sql_storage_field_storage_delete_field($field) {
     ->execute();
 
   // Move the table to a unique name while the table contents are being deleted.
-  $field['deleted'] = 1;
+  $field['deleted'] = TRUE;
   $new_table = _field_sql_storage_tablename($field);
   $revision_new_table = _field_sql_storage_revision_tablename($field);
   db_rename_table($table, $new_table);