It would be better, I think, if metadata was attachable via a protocol 
rather than than a wrapper: then you could just extend the protocol to any 
arbitrary Java class. Wrappers are a pain to make work because of wrapping 
/ unwrapping and protocols also have the advantage of being very efficient.

I've wanted a similar feature with respect to "seq" as well (a protocol for 
things that can be treated as sequences)

On Saturday, 31 August 2013 03:16:26 UTC+8, JvJ wrote:
>
> I've noticed that, when doing a lot of Java interop, it's impossible to 
> attach metadata to most Java objects, since they don't implement the IMeta 
> interface.  A workaround for this would be to do something like put every 
> Java object in a single-element list and attach metadata to the list, but 
> this is annoying.  Would it be possible (or even useful) to create some 
> kind of generic IMeta structure that can wrap other Java objects and have 
> them act like normal, except for the added metadata (or even other 
> Clojure-esque features)?
>

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