SimpleSlice now calls [[Get]] before [[Has]] when generating copy

src/array.js

Index: src/array.js
diff --git a/src/array.js b/src/array.js
index a4e681c7e2a212df91a5118b5e9286a1b5d2575a..55dd79751c27fc960c5caca1bc068b7a0c5ecc22 100644
--- a/src/array.js
+++ b/src/array.js
@@ -284,11 +284,8 @@ function SparseMove(array, start_i, del_count, len, num_additional_args) {
 function SimpleSlice(array, start_i, del_count, len, deleted_elements) {
   for (var i = 0; i < del_count; i++) {
     var index = start_i + i;
-    // The spec could also be interpreted such that %HasOwnProperty
-    // would be the appropriate test.  We follow KJS in consulting the
-    // prototype.
-    var current = array[index];
-    if (!IS_UNDEFINED(current) || index in array) {
+    if (index in array) {
+      var current = array[index];
       // The spec requires [[DefineOwnProperty]] here, %AddElement is close
       // enough (in that it ignores the prototype).
       %AddElement(deleted_elements, i, current, NONE);