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/** Change the pixel at position i into {@link CellId} t.
This standard implementation also keeps track of cell volumes
for all nonzero cell IDs. Subclasses may want to do more,
such as also keeping track of perimeters or even centroids.
In that case, this method needs to be overridden.

See also {@link setpix} for a method working with {@link ArrayCoordinate}s.

@param {IndexCoordinate} i - coordinate of pixel to change.
@param {CellId} t - cellid to change this pixel into.
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