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afdko 5.0.1 regressed variable-font hinting: otfautohint aborts with an AssertionError in calcInstanceStems() when a high ghost stem is a glyph's first stem (e.g. small diagonal accents), which broke cantarell-fonts. Backport the upstream fix as a patch to afdko. https://github.com/adobe-type-tools/afdko/pull/1844 Closes #535887 Assisted-by: Claude Code (claude-opus-4-8)