improving configs by using the debug parameter

jms/serializer-bundle/1.2/etc/packages/dev/jms_serializer.yaml

@@ -2,5 +2,3 @@ jms_serializer:
     visitors:
         json:
             options: JSON_PRETTY_PRINT
-        xml:
-            format_output: true

jms/serializer-bundle/1.2/etc/packages/jms_serializer.yaml

@@ -2,7 +2,10 @@ jms_serializer:
     enable_short_alias: false
     handlers:
         datetime:
-            default_format: "Y-m-d\\TH:i:sP"
+            default_format: 'Y-m-d\TH:i:sP'
+    visitors:
+        xml:
+            format_output: '%kernel.debug%'
 #    auto_detection: false
 #    directories:
 #        any-name:

jms/serializer-bundle/1.2/etc/packages/prod/jms_serializer.yaml

@@ -1,4 +0,0 @@
-jms_serializer:
-    visitors:
-        xml:
-            format_output: false

jms/serializer-bundle/1.5/etc/packages/dev/jms_serializer.yaml

@@ -2,5 +2,3 @@ jms_serializer:
     visitors:
         json:
             options: JSON_PRETTY_PRINT
-        xml:
-            format_output: true

jms/serializer-bundle/1.5/etc/packages/jms_serializer.yaml

@@ -1,16 +1,18 @@
 jms_serializer:
     enable_short_alias: false
-
     handlers:
         datetime:
-            default_format: "Y-m-d\\TH:i:sP"
+            default_format: 'Y-m-d\TH:i:sP'
         array_collection:
             initialize_excluded: false # suggested false for better performance
-
     subscribers:
         doctrine_proxy:
             initialize_virtual_types: false # suggested false for better performance
             initialize_excluded: false # suggested false for better performance
+    visitors:
+        xml:
+            format_output: '%kernel.debug%'
+
 #    metadata:
 #        auto_detection: false
 #        directories:

jms/serializer-bundle/1.5/etc/packages/prod/jms_serializer.yaml

@@ -1,4 +0,0 @@
-jms_serializer:
-    visitors:
-        xml:
-            format_output: false

jms/serializer-bundle/2.0/etc/packages/dev/jms_serializer.yaml

@@ -2,5 +2,3 @@ jms_serializer:
     visitors:
         json:
             options: JSON_PRETTY_PRINT
-        xml:
-            format_output: true

jms/serializer-bundle/2.0/etc/packages/jms_serializer.yaml

@@ -1,4 +1,7 @@
-# jms_serializer:
+jms_serializer:
+    visitors:
+        xml:
+            format_output: '%kernel.debug%'
 #    metadata:
 #        auto_detection: false
 #        directories:

jms/serializer-bundle/2.0/etc/packages/prod/jms_serializer.yaml

@@ -1,4 +0,0 @@
-jms_serializer:
-    visitors:
-        xml:
-            format_output: false