Lexical variables are another matter, as they don't belong to a given package but exist globally as long as there is a reference to them. In my opinion this is a bit of a hack, but access can be limited by creating data that is accessible only by reference, so that code can reach that data only if it has been given a reference to it.
It doesn't seem like a hack to me; it lets you use closures.
(cf http://www.wikipedia.org/wiki/Closure_(programming) )
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