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A knockout element with one opaque Normal solid fill (a path or compound, no mask, effects or isolation) is drawn once under AntiAlias::None, including the internal hard-edge frame of Art Optimized supersampled exports, instead of being erased and added back through per-element backdrop layers. Analytical antialiasing keeps the existing compositor and rounding. Exact-pixel tests compare against the general knockout path for paths and compound holes across precision, supersampling, translucent parents and copied backdrops, and check that the backdrop rasters are skipped; translucent fills keep their knockout compositing. # Conflicts: # docs/roadmap.md # docs/target-app-parity.md