small fix in expand

Author: tmhglnd

build/ts.bundle.js

@@ -1,6 +1,6 @@
 {
   "name": "total-serialism",
-  "version": "2.1.3",
+  "version": "2.1.4",
   "description": "A set of methods for the generation and transformation of number sequences useful in algorithmic composition",
   "main": "index.js",
   "scripts": {

build/ts.es5.js

@@ -314,7 +314,7 @@ function expand(a=[0, 0], l=1){
 	let arr = a.slice();
 	let acc = arr[arr.length-1];
 	// accumulate the change and store in array
-	for (let c in chg){
+	for (let c=0; c<chg.length; c++){
 		arr.push(acc += chg[c]);
 	}
 	return arr;