Bump to v4.17.5.

defaults.js

@@ -1,8 +1,14 @@
-define(['./_apply', './assignInWith', './_baseRest', './_customDefaultsAssignIn'], function(apply, assignInWith, baseRest, customDefaultsAssignIn) {
+define(['./_baseRest', './eq', './_isIterateeCall', './keysIn'], function(baseRest, eq, isIterateeCall, keysIn) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
 
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
   /**
    * Assigns own and inherited enumerable string keyed properties of source
    * objects to the destination object for all destination properties that
@@ -24,9 +30,35 @@ define(['./_apply', './assignInWith', './_baseRest', './_customDefaultsAssignIn'
    * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
    * // => { 'a': 1, 'b': 2 }
    */
-  var defaults = baseRest(function(args) {
-    args.push(undefined, customDefaultsAssignIn);
-    return apply(assignInWith, undefined, args);
+  var defaults = baseRest(function(object, sources) {
+    object = Object(object);
+
+    var index = -1;
+    var length = sources.length;
+    var guard = length > 2 ? sources[2] : undefined;
+
+    if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+      length = 1;
+    }
+
+    while (++index < length) {
+      var source = sources[index];
+      var props = keysIn(source);
+      var propsIndex = -1;
+      var propsLength = props.length;
+
+      while (++propsIndex < propsLength) {
+        var key = props[propsIndex];
+        var value = object[key];
+
+        if (value === undefined ||
+            (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+          object[key] = source[key];
+        }
+      }
+    }
+
+    return object;
   });
 
   return defaults;