Bump to v4.9.0.

differenceWith.js

@@ -30,7 +30,7 @@ define(['./_baseDifference', './_baseFlatten', './isArrayLikeObject', './last',
       comparator = undefined;
     }
     return isArrayLikeObject(array)
-      ? baseDifference(array, baseFlatten(values, 1, true), undefined, comparator)
+      ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
       : [];
   });