[pattern rewriter] Only desugar to call %ToName on computed properties

src/runtime/runtime-object.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 753 matching lines @@
 RUNTIME_FUNCTION(Runtime_CopyDataPropertiesWithExcludedProperties) {
   HandleScope scope(isolate);
   DCHECK_LE(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, source, 0);
 
   // 2. If source is undefined or null, let keys be an empty List.
   if (source->IsUndefined(isolate) || source->IsNull(isolate)) {
     return isolate->heap()->undefined_value();
   }
 
-  ScopedVector<Handle<Name>> excluded_properties(args.length() - 1);
+  ScopedVector<Handle<Object>> excluded_properties(args.length() - 1);
   for (int i = 1; i < args.length(); i++) {
-    excluded_properties[i - 1] = args.at<Name>(i);
+    Handle<Object> property = args.at(i);
+    uint32_t property_num;
+    // We convert string to number if possible, in cases of computed
+    // properties resolving to numbers, which would've been strings
+    // instead because of our call to %ToName() in the desugaring for
+    // computed properties.
+    if (property->IsString() &&
+        String::cast(*property)->AsArrayIndex(&property_num)) {
+      property = isolate->factory()->NewNumberFromUint(property_num);
+    }
+
+    excluded_properties[i - 1] = property;
   }
 
   Handle<JSObject> target =
       isolate->factory()->NewJSObject(isolate->object_function());
   MAYBE_RETURN(JSReceiver::SetOrCopyDataProperties(isolate, target, source,
                                                    &excluded_properties, false),
                isolate->heap()->exception());
   return *target;
 }
 
@@ skipping 177 matching lines @@
   if (!success) return isolate->heap()->exception();
   MAYBE_RETURN(
       JSReceiver::CreateDataProperty(&it, value, Object::THROW_ON_ERROR),
       isolate->heap()->exception());
   return *value;
 }
 
 
 }  // namespace internal
 }  // namespace v8