Insert a size 1 axis into the data array and bounds in place.
See also
flip, squeeze, transpose
Specify the position amongst the data array axes where the new axis is to be inserted. By default the new axis is inserted at position 0, the slowest varying position.
i : bool, optional
out : cf.Coordinate
cf.DimensionCoordinate.equals
cf.DimensionCoordinate.fill_value
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