Changes to the mirror handling...

test/mjsunit/mirror-number.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 35 matching lines @@
 
   // Test text representation
   assertEquals(String(n), mirror.toText());
 
   // Parse JSON representation and check.
   var fromJSON = eval('(' + json + ')');
   assertEquals('number', fromJSON.type);
   if (!isNaN(n)) {
     assertEquals(n, fromJSON.value);
   } else {
-    assertTrue(isNaN(fromJSON.value));
+    // NaN values are encoded as strings.
+    assertTrue(typeof fromJSON.value == 'string');
+    if (n === Infinity) {
+      assertEquals('Infinity', fromJSON.value);
+    } else if (n === -Infinity) {
+      assertEquals('-Infinity', fromJSON.value);
+    } else {
+      assertEquals('NaN', fromJSON.value);
+    }
   }
 }
 
 
 // Test a number of different numbers.
 testNumberMirror(-7);
 testNumberMirror(-6.5);
 testNumberMirror(0);
 testNumberMirror(42);
 testNumberMirror(100.0002);
 testNumberMirror(Infinity);
 testNumberMirror(-Infinity);
 testNumberMirror(NaN);