all accumulators should be available as expressions

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      Not clear why $first $last and $addToSet are the only accumulators not available as regular expressions with array argument.  In particular $last is helpful to avoid very verbose syntax for $arrayElemAt plus calculate position of last element ($subtract 1 from $size)

              Assignee:
              Backlog - Query Team (Inactive)
              Reporter:
              Asya Kamsky
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                Created:
                Updated:
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