refactor(geom): update area() impl for Path

Author: postspectacular

packages/geom/src/area.ts

@@ -75,9 +75,10 @@ export const area: MultiFn1O<IShape, boolean, number> = defmulti(
 		group: ({ children }: Group) =>
 			children.reduce((sum, $) => sum + area($, false), 0),
 
-		path: ($: Path) => {
-			if (!$.closed) return 0;
-			return asPolygon($).reduce((acc, p) => acc + area(p, true), 0);
+		path: ($: Path, signed?) => {
+			return $.closed
+				? asPolygon($).reduce((acc, p) => acc + area(p, signed), 0)
+				: 0;
 		},
 
 		plane: () => Infinity,