Let's try mozilla's fixedCharAt function

commands/drawDesign.cjs

@@ -226,7 +226,7 @@ function charIterate(input) {
 			charIterateState = 0;
 		}
 	}
-	console.log(charIterateState, input.charAt(charIterateState));
+	console.log(charIterateState, fixedCharAt(input, charIterateState));
 	return charIterateState;
 }