Ensure that ToPrimitive is called on all objects involved in comparisons <, <...

src/runtime.js

Index: src/runtime.js
===================================================================
--- src/runtime.js	(revision 4966)
+++ src/runtime.js	(working copy)
@@ -112,7 +112,7 @@
 // the result when either (or both) the operands are NaN.
 function COMPARE(x, ncr) {
   var left;
-
+  var right;
   // Fast cases for string, numbers and undefined compares.
   if (IS_STRING(this)) {
     if (IS_STRING(x)) return %_StringCompare(this, x);
@@ -123,14 +123,18 @@
     if (IS_UNDEFINED(x)) return ncr;
     left = this;
   } else if (IS_UNDEFINED(this)) {
+    if (!IS_UNDEFINED(x)) {
+      %ToPrimitive(x, NUMBER_HINT);
+    }
     return ncr;
+  } else if (IS_UNDEFINED(x)) {
+    %ToPrimitive(this, NUMBER_HINT);
+    return ncr;
   } else {
-    if (IS_UNDEFINED(x)) return ncr;
     left = %ToPrimitive(this, NUMBER_HINT);
   }
 
-  // Default implementation.
-  var right = %ToPrimitive(x, NUMBER_HINT);
+  right = %ToPrimitive(x, NUMBER_HINT);
   if (IS_STRING(left) && IS_STRING(right)) {
     return %_StringCompare(left, right);
   } else {