James, in case you haven't seen it, this is treated _extensively_ in the FAQ. 
Make a nice cup of tea and pull up a comfy chair before you start reading :-).

--Tim

On Sunday, February 01, 2015 01:16:19 AM Jutho wrote:
> As long as not all parameters of a parametric concrete type are fully
> specified, the type is treated as abstract. So in both cases your
> collection would be of abstract elements and they would not be stored
> packed in memory. I don't think what you are requesting is possible, but I
> might be mistaken. If the elements of the collection are of a concrete
> type, then applying a function to them should always be the same function.
> If this were not the case, then type inference could not work.

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