In Font Book.app one of the criteria for creating a Smart Collection is "Design style".
How does Font Book.app determine whether or not a given font falls into one of the available categories?
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OK, I think I figured it out... Opening a font in RoboFont, I scoured all the obscure meta-info available and finally found the entry that seems to correspond to what FontBook uses for the Design Style in the section called Panose (a term I had never heard of!). Long story short... FontBook seems to probably use the
Proportion to determine the style. 😜