diff -r e3f671b50e93 -r 9cbf1f2ad7ee vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java	Wed Jan 30 22:23:21 2013 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java	Thu Jan 31 13:42:14 2013 +0100
@@ -72,8 +72,12 @@
         return Long.MAX_VALUE;
     }
     
-    public static long addL(long x, long y) {
-        return (x + y);
+    public static long addL(byte[] arrX, byte[] arrY) throws IOException {
+        ByteArrayInputStream isX = new ByteArrayInputStream(arrX);
+        DataInputStream disX = new DataInputStream(isX);
+        ByteArrayInputStream isY = new ByteArrayInputStream(arrY);
+        DataInputStream disY = new DataInputStream(isY);
+        return (disX.readLong() + disY.readLong());
     }
     
     public static long subL(long x, long y) {