style and allowReserved defaults are only in effect when any of style, explode, allowReserved are present

see #4899

Author: karenetheridge

src/schemas/validation/schema.yaml

@@ -494,7 +494,6 @@ $defs:
         additionalProperties:
           $ref: '#/$defs/header-or-reference'
       style:
-        default: form
         enum:
           - form
           - spaceDelimited
@@ -503,8 +502,22 @@ $defs:
       explode:
         type: boolean
       allowReserved:
-        default: false
         type: boolean
+    dependentSchemas:
+      style:
+        properties:
+          allowReserved:
+            default: false
+      explode:
+        properties:
+          style:
+            default: form
+          allowReserved:
+            default: false
+      allowReserved:
+        properties:
+          style:
+            default: form
     allOf:
       - $ref: '#/$defs/specification-extensions'
       - $ref: '#/$defs/styles-for-form'