If the multivalues have many many values, and you are adding to the end, then a
speed up may be possible.
MATREAD in the data, RAISE those array elements you are changing. Before the
MATWRITE, LOWER all array elements you raised.
As I understand it, Universe keeps internal track on attributes, so processing
these in ascending order is a LOT faster than it used to be. However this is
not done for multivalues (space considerations?).
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