Re: [csswg-drafts] [css-fonts-4] font-stretch is unfortunately named

I wonder if we need a more flexible model to account for complex font 
families. The [Adobe Kepler 
](https://www.myfonts.com/fonts/adobe/kepler/)family has 168 members, 
with a facet of optical weight (subhead | display | caption | regular)
 in addition to font-weight, font-stretch, and font-style. 
[Knockout](https://www.typography.com/fonts/knockout/styles/) has nine
 weights ranging from "flyweight" to "sumo", and four widths, with 
naming utterly unrelated to existing CSS values.

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