I don’t think anyone wants to see a faux ultra black of their nice text face.
I take extrapolation to imply something beyond the defined range of the axes, and hence I think it…
John Hudson
81

These are indeed big ideas to communicate and I understand that you want to keep the discussion manageable. In this case though, with masters on the axis extremes, but not in the corner, font makers will observe the faux superimposition of the masters. The problem will not go away by changing terminology, it’s part of the math.

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