diff -u b/core/modules/image/config/image.style.large.yml b/core/modules/image/config/image.style.large.yml
--- b/core/modules/image/config/image.style.large.yml
+++ b/core/modules/image/config/image.style.large.yml
@@ -1,10 +1,10 @@
-name: 'large'
+name: large
 effects:
-  image_scale_480_480_1:
-    name: 'image_scale'
-    ieid: 'image_scale_480_480_1'
-    data:
-      width: '480'
-      height: '480'
-      upscale: '1'
-    weight: '0'
+    image_scale_480_480_1:
+        name: image_scale
+        data:
+            width: '480'
+            height: '480'
+            upscale: '1'
+        weight: '0'
+        ieid: image_scale_480_480_1
diff -u b/core/modules/image/config/image.style.medium.yml b/core/modules/image/config/image.style.medium.yml
--- b/core/modules/image/config/image.style.medium.yml
+++ b/core/modules/image/config/image.style.medium.yml
@@ -1,10 +1,10 @@
-name: 'medium'
+name: medium
 effects:
-  image_scale_220_220_1:
-    name: 'image_scale'
-    ieid: 'image_scale_220_220_1'
-    data:
-      width: '220'
-      height: '220'
-      upscale: '1'
-    weight: '0'
+    image_scale_220_220_1:
+        name: image_scale
+        data:
+            width: '220'
+            height: '220'
+            upscale: '1'
+        weight: '0'
+        ieid: image_scale_220_220_1
diff -u b/core/modules/image/config/image.style.thumbnail.yml b/core/modules/image/config/image.style.thumbnail.yml
--- b/core/modules/image/config/image.style.thumbnail.yml
+++ b/core/modules/image/config/image.style.thumbnail.yml
@@ -1,10 +1,10 @@
-name: 'thumbnail'
+name: thumbnail
 effects:
-  image_scale_100_100_1:
-    name: 'image_scale'
-    ieid: 'image_scale_100_100_1'
-    data:
-      width: '100'
-      height: '100'
-      upscale: '1'
-    weight: '0'
+    image_scale_100_100_1:
+        name: image_scale
+        data:
+            width: '100'
+            height: '100'
+            upscale: '1'
+        weight: '0'
+        ieid: image_scale_100_100_1
diff -u b/core/modules/system/config/system.cron.yml b/core/modules/system/config/system.cron.yml
--- b/core/modules/system/config/system.cron.yml
+++ b/core/modules/system/config/system.cron.yml
@@ -5 +5 @@
-cron_key: 'drupal'
+cron_key: drupal
diff -u b/core/modules/system/config/system.rss-publishing.yml b/core/modules/system/config/system.rss-publishing.yml
--- b/core/modules/system/config/system.rss-publishing.yml
+++ b/core/modules/system/config/system.rss-publishing.yml
@@ -1,3 +1,3 @@
-feed_description:
+feed_description: ''
 feed_default_items: '10'
-feed_item_length: 'fulltext'
+feed_item_length: fulltext