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There’s no reason it should be.
See https://www.microsoft.com/typography/otspec/name.htm, for name ID 16:
and for name ID 17:
Ori Ben-Dor said:
Looks promising! But I'd like to see how the new versions work in context. Could you please show a block of text (preferably with the word 'Garamond')?
Christian Thalmann said:
Steve: Yes, that's intentional insofar as the /a's top does not just kiss the x-height, it lands there in a horizontal. As such, I feel it wants to be flush with the stem top of /n.