I think the general solution would be a weak identity map.  

On Sunday, September 1, 2013 6:58:25 AM UTC-7, Colin Jones wrote:
>
> I thought of protocols initially here too, but protocols just define 
> functions, so where would the data live that you want as metadata? 
>
> A closure over the data? This implies extending the protocol on a 
> per-instance basis, which afaik doesn't exist (cljs design work aside 
> http://dev.clojure.org/display/design/specify+i.e.+reify+for+instances).
>
> Some global map? We can't key on arbitrary java objects since the hashcode 
> can change. Is there a key that will work?
>
> A var? We can already do that.
>
> Maybe there's someplace I'm missing where you could store this data and 
> look it up later via a protocol implementation?
>
>

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