diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug849781-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug849781-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function assertArraysFirstEqual(a, b) {
+    if (a.length != b.length) {}
+}
+function check(b) {
+    var a = deserialize(serialize(b));
+    assertArraysFirstEqual(a, b);
+}
+check(new Int8Array(1));
+evaluate("check(['a', 'b']);");