> Yes, why not? The scoping of objects is the same, and using 
> list indexing is not that bad a workaround when you need to 
> rebind an object. Another way would be to do

While you may have created closure-like behaviour by using the array
workaround, it is not a lexical closure.

A lexical closure has access to the _variables_ in the environment, not
the objects.

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