On Thu, Nov 1, 2012 at 12:41 PM, Geoffrey Garen <ggaren at apple.com> wrote: >> On the other hand, what about JSC bindings? > > JSC bindings do not store the wrapper in two places. I'm not sure I fully understand your message. JSC uses ScriptWrappable for Nodes and uses a HashMap for non-Nodes (in the main world), just like V8 does. Adam