Reuse resolved features and borrowed GDEF classes for mark ownership,
skip the character-level pass without eligible mark glyphs, and reuse
paint-only boundary classification. Compare non-paint style attributes
without cloning while preserving the previous PartialEq behavior.
Add deterministic font variants and a field-by-field style oracle
to preserve glyph geometry, conservative ownership and NaN handling.
Ahmed Gomaa
f3e5cfad26