diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/JSON/stringify-replacer-array-duplicated-element.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/JSON/stringify-replacer-array-duplicated-element.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,69 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+var gTestfile = 'stringify-replacer-array-hijinks.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 648471;
+var summary =
+  "Better/more correct handling for replacer arrays with getter array index " +
+  "properties";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var bigOdd = Math.pow(2, 50) + 1;
+
+function two()
+{
+  return Math.random() < 0.5 ? 2 : "2";
+}
+
+assertEq(JSON.stringify({ 1: 1 }, [1, 1]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [1, "1"]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [1, bigOdd % two()]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, ["1", 1]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, ["1", "1"]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, ["1", bigOdd % two()]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [bigOdd % two(), 1]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [bigOdd % two(), "1"]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [bigOdd % two(), bigOdd % two()]), '{"1":1}');
+
+
+assertEq(JSON.stringify({ 1: 1 }, [1, new String(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [1, new Number(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, ["1", new Number(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, ["1", new String(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [bigOdd % two(), new Number(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [bigOdd % two(), new String(1)]), '{"1":1}');
+
+
+assertEq(JSON.stringify({ 1: 1 }, [new String(1), new String(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [new String(1), new Number(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [new Number(1), new String(1)]), '{"1":1}');
+
+assertEq(JSON.stringify({ 1: 1 }, [new Number(1), new Number(1)]), '{"1":1}');
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");