diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testNumToString.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testNumToString.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+function testNumToString() {
+    var r = [];
+    var d = 123456789;
+    for (var i = 0; i < 10; ++i) {
+        r = [
+             d.toString(),
+             (-d).toString(),
+             d.toString(10),
+             (-d).toString(10),
+             d.toString(16),
+             (-d).toString(16),
+             d.toString(36),
+             (-d).toString(36)
+            ];
+    }
+    return r.join(",");
+}
+assertEq(testNumToString(), "123456789,-123456789,123456789,-123456789,75bcd15,-75bcd15,21i3v9,-21i3v9");