Correct format for vector params

Author: drewyoungren

media/src/stories/ArcLength.svelte

@@ -156,18 +156,18 @@
                 a: new math.OperatorNode('-', 'subtract', [
                     X.transform(toN(nVects, true, A, B)),
                     X.transform(toN(nVects, false, A, B)),
-                ]),
+                ]).toString(),
                 b: new math.OperatorNode('-', 'subtract', [
                     Y.transform(toN(nVects, true, A, B)),
                     Y.transform(toN(nVects, false, A, B)),
-                ]),
+                ]).toString(),
                 c: new math.OperatorNode('-', 'subtract', [
                     Z.transform(toN(nVects, true, A, B)),
                     Z.transform(toN(nVects, false, A, B)),
-                ]),
-                x: X.transform(toN(nVects, false, A, B)),
-                y: Y.transform(toN(nVects, false, A, B)),
-                z: Z.transform(toN(nVects, false, A, B)),
+                ]).toString(),
+                x: X.transform(toN(nVects, false, A, B)).toString(),
+                y: Y.transform(toN(nVects, false, A, B)).toString(),
+                z: Z.transform(toN(nVects, false, A, B)).toString(),
                 n0: '0',
                 n1: `${nVects - 1}`,
             },