diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testString.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testString.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+function testString() {
+    var q;
+    for (var i = 0; i <= 9; ++i) {
+        q = [];
+        q.push(String(void 0));
+        q.push(String(true));
+        q.push(String(5));
+        q.push(String(5.5));
+        q.push(String("5"));
+        q.push(String([5]));
+    }
+    return q.join(",");
+}
+assertEq(testString(), "undefined,true,5,5.5,5,5");