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Over on www-style, Tom Phinney wrote,
"In the broader universe of fonts, these [divergently proportioned fonts] are not the norm at all. Metrically similar fonts do make up a significant chunk of system fonts, though. (Arial/Helvetica, Times/Times New Roman, Book Antiqua/Palatino, etc.)"
Could anyone who has produced "metric-compatible" fonts explain how copying the metrics of another font is not copyright infringement? :-)