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arraymodule's repr used "string += ',' + el" for each element in 
the array.  Lists and dicts did a string.join to build the repr.

Attached patch builds a tuple of array elements and then 
joins them.  (actually for some reason I can't attach now, I'll 
post the patch in patch manager)

This fixes the time issue, but I don't know enough about how 
you guys manage memory in each case to tell what impact 
that'll have on really, really big arrays (although I imagine it 
takes more memory).