--- old/src/java.base/share/classes/java/lang/Number.java	2019-08-27 17:27:30.778324386 -0700
+++ new/src/java.base/share/classes/java/lang/Number.java	2019-08-27 17:27:30.558324386 -0700
@@ -119,5 +119,6 @@
     }
 
     /** use serialVersionUID from JDK 1.0.2 for interoperability */
+    @java.io.Serial
     private static final long serialVersionUID = -8742448824652078965L;
 }