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When comparing the "superiors" feature with the "fractions" feature in a number of OpenType fonts from Adobe and Linotype (and others?), some questions arise. Specifically, in the superior glyph range, why do letters have a different baseline from numbers and punctation? This is not the case with glyphs covered by the fractions feature.
Here are some examples illustrated:
Could this have something to do with a legacy work-around? If a type designer, or major type foundry, were to change this, would it cause any problems? Are there users who expect the superior feature to be defined in this manner?