Version 3.7.1

src/array.js

Index: src/array.js
===================================================================
--- src/array.js	(revision 9808)
+++ src/array.js	(working copy)
@@ -1013,18 +1013,22 @@
   }
   if (IS_NULL_OR_UNDEFINED(receiver)) {
     receiver = %GetDefaultReceiver(f) || receiver;
+  } else if (!IS_SPEC_OBJECT(receiver)) {
+    receiver = ToObject(receiver);
   }
 
-  var result = [];
-  var result_length = 0;
+  var result = new $Array();
+  var accumulator = new InternalArray();
+  var accumulator_length = 0;
   for (var i = 0; i < length; i++) {
     var current = array[i];
     if (!IS_UNDEFINED(current) || i in array) {
       if (%_CallFunction(receiver, current, i, array, f)) {
-        result[result_length++] = current;
+        accumulator[accumulator_length++] = current;
       }
     }
   }
+  %MoveArrayContents(accumulator, result);
   return result;
 }
 
@@ -1045,6 +1049,8 @@
   }
   if (IS_NULL_OR_UNDEFINED(receiver)) {
     receiver = %GetDefaultReceiver(f) || receiver;
+  } else if (!IS_SPEC_OBJECT(receiver)) {
+    receiver = ToObject(receiver);
   }
 
   for (var i = 0; i < length; i++) {
@@ -1074,6 +1080,8 @@
   }
   if (IS_NULL_OR_UNDEFINED(receiver)) {
     receiver = %GetDefaultReceiver(f) || receiver;
+  } else if (!IS_SPEC_OBJECT(receiver)) {
+    receiver = ToObject(receiver);
   }
 
   for (var i = 0; i < length; i++) {
@@ -1102,6 +1110,8 @@
   }
   if (IS_NULL_OR_UNDEFINED(receiver)) {
     receiver = %GetDefaultReceiver(f) || receiver;
+  } else if (!IS_SPEC_OBJECT(receiver)) {
+    receiver = ToObject(receiver);
   }
 
   for (var i = 0; i < length; i++) {
@@ -1129,6 +1139,8 @@
   }
   if (IS_NULL_OR_UNDEFINED(receiver)) {
     receiver = %GetDefaultReceiver(f) || receiver;
+  } else if (!IS_SPEC_OBJECT(receiver)) {
+    receiver = ToObject(receiver);
   }
 
   var result = new $Array();