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I'd like to change the underline thickness in a compiled OT font automatically, since the AFDKO seems to have no keywords for this.
My tool of choice is fontTools.
When decompiling the font to XML via ttx, this is setting that at least InDesign reads the value from:
How to reach this setting via Python+fontTools?
I've come as far as this:
ttf = TTFont(path)
Ant now what? I can't find out how to reach the said setting.