Sometimes when you're merging one designspace into another, you don't have the same set of masters, and sometimes that's OK - if you have all the corner masters, you can allow the internal masters to go sparse. This allows add-ds-subsets to optionally proceed without a full set of matching masters.
Sometimes when you're merging one designspace into another, you don't have the same set of masters, and sometimes that's OK - if you have all the corner masters, you can allow the internal masters to go sparse. This allows
add-ds-subsetsto optionally proceed without a full set of matching masters.