_handleSaveResponse: Merge response value with original attributes for nested objects

Author: rdhelms

src/ParseObject.js

@@ -408,14 +408,7 @@ class ParseObject {
         changes[attr] = new ParseACL(response[attr]);
       } else if (attr !== 'objectId') {
         const val = decode(response[attr]);
-        if (val && typeof val === 'object'
-          && !(val instanceof Array)
-          && !(val instanceof ParseObject)
-          && !(val instanceof ParseFile)
-          && !(val instanceof ParseRelation)
-          && !(val instanceof Op)
-          && !(Object.prototype.toString.call(val) === '[object Date]')) {
-
+        if (val && Object.getPrototypeOf(val) === Object.prototype) {
           // Update the object by merging in updates w/ old object
           changes[attr] = { ...this.attributes[attr], ...val }
         } else {