Bump to v4.9.0.

_isFlattenableIteratee.js

@@ -0,0 +1,16 @@
+import isArray from './isArray';
+import isFunction from './isFunction';
+
+/**
+ * Checks if `value` is a flattenable array and not a `_.matchesProperty`
+ * iteratee shorthand.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
+ */
+function isFlattenableIteratee(value) {
+  return isArray(value) && !(value.length == 2 && !isFunction(value[0]));
+}
+
+export default isFlattenableIteratee;