TaggedArrays (Proposal)

[Mark Roos]

Hi Jim

I was wondering if you could post the use case that led you develop the 
TaggedArray?
I looked over our Smalltalk app and I could not see an obvious pattern 
where mixing
primitives and references in a collection is common.

On a similar note I was curious how you are avoiding the integer 
allocation when using
a 'for' like pattern to index over an array. That is a real performance 
hit for me so I
am looking for a good solution

thanks
mark
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