>> The Weak module is never the right tool for implementing a cache.
>
>I'm not disputing this, but I would like you hear your thoughts on  
>this topic. Why?

Weak references go away at the whim of the GC, not when it would be
useful to flush the cache. A longer explanation and more about weak
references can be found in the Cuoq/Doligez article in last year's
workshop on ML (http://portal.acm.org/citation.cfm?id=1411308).

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