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I'm seeing a bit of a bulge in the curves of the /U and similar glyphs (e.g /⊆, /∈).
Derivative: $b(0)=f(0)$, $b(1)=f(1)$, $b'(0)=f'(0)$, $b'(1)=f'(1)$
In Arno Pro the accents are placed above the small caps. Is it a
rule? John, do you place the accents above or in the left of small caps?
Above. Then I use OpenType Contextual Alternates substitutions to
suppress marks in both all-caps and small-caps settings, following the
modern convention, which allows users to turn that feature off and
display marks if they desire.