Fix object coercion.

filterObject.js

@@ -17,8 +17,10 @@
  * // => [5, 10]
  */
 function filterObject(object, predicate) {
+  object = Object(object)
   const result = []
-  Object.keys(Object(object)).forEach((key) => {
+
+  Object.keys(object).forEach((key) => {
     const value = object[key]
     if (predicate(value, key, object)) {
       result.push(value)