Bump to v4.6.0.

assignIn.js

@@ -1,7 +1,13 @@
+import assignValue from './_assignValue';
 import copyObject from './_copyObject';
 import createAssigner from './_createAssigner';
+import isArrayLike from './isArrayLike';
+import isPrototype from './_isPrototype';
 import keysIn from './keysIn';
 
+/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
+var nonEnumShadows = !({ 'valueOf': 1 }).propertyIsEnumerable('valueOf');
+
 /**
  * This method is like `_.assign` except that it iterates over own and
  * inherited source properties.
@@ -32,7 +38,13 @@ import keysIn from './keysIn';
  * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }
  */
 var assignIn = createAssigner(function(object, source) {
-  copyObject(source, keysIn(source), object);
+  if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
+    copyObject(source, keysIn(source), object);
+    return;
+  }
+  for (var key in source) {
+    assignValue(object, key, source[key]);
+  }
 });
 
 export default assignIn;