Forgive me that I've not kept track of where we are in the discussion about the
additional receiver argument.
I think I just found a pretty important use case for the receiver argument. Say
you want to keep some information about a proxy object in a Map or a WeakMap,
and you want the handler to be able to access that information. Then you're
going to need the proxy object to do it.
I suppose you can close over the proxy value:
var proxy;
var handler = { ... proxy ... };
proxy = Proxy.create(handler);
But then you have to make a fresh handler for each instance.
Dave
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