Hi Jonathan,
I have a question about the experimental version: do you plan to include
font expansion?
I don't know how much this implementation differs from the margin
kerning, but I guess this would be easier to deploy by users than margin
kerning, since the same value would be applied to stretch or shrink all
glyphs in a font.
I guess this might be of interest to other members of the list.
Thanks for the further XeTeX development,
Pablo
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