I think DC is right, its just on the stated group-by property.
I also think I'm right but I don't understand what you mean by teh
second half of the above.
So I was wrong in assuming duplicates are removed!
It wouldn't make sense to remove items with the same value for
the group-by property as they are the things you are putting in each
group. Clearly you want more than one thing in a group in general
otherwise it would be a remove-duplicates function, not a grouping
construct.
David
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