[Bug]: overridable mergeDeep to fix null typeof check

README.md

@@ -136,7 +136,7 @@ import { EmberChangeset, Changeset } from 'ember-changeset';
 class MyChangeset extends EmberChangeset {
   save() {
     super.save(...arguments);
-    // my other stuff
+    // do stuff
   }
 }
 

addon/index.js

@@ -46,6 +46,7 @@ export class EmberChangeset extends BufferedChangeset {
   // override base class
   // DO NOT override setDeep. Ember.set does not work with Ember.set({}, 'user.name', 'foo');
   getDeep = safeGet;
+  mergeDeep = mergeDeep;
 
   // override base class
   safeGet(obj, key) {
@@ -95,9 +96,9 @@ export class EmberChangeset extends BufferedChangeset {
     let content = this[CONTENT];
     let changes = this[CHANGES];
 
-    let pendingChanges = mergeDeep(Object.create(Object.getPrototypeOf(content)), content, { safeGet, safeSet });
+    let pendingChanges = this.mergeDeep(Object.create(Object.getPrototypeOf(content)), content, { safeGet, safeSet });
 
-    return mergeDeep(pendingChanges, changes, { safeGet, safeSet });
+    return this.mergeDeep(pendingChanges, changes, { safeGet, safeSet });
   }
 
   /**
@@ -180,7 +181,7 @@ export class EmberChangeset extends BufferedChangeset {
 
       // we want mutation on original object
       // @tracked
-      this[CONTENT] = mergeDeep(content, changes, { safeGet, safeSet });
+      this[CONTENT] = this.mergeDeep(content, changes, { safeGet, safeSet });
     }
 
     this[PREVIOUS_CONTENT] = oldContent;

config/ember-try.js

@@ -23,10 +23,10 @@ module.exports = async function () {
         },
       },
       {
-        name: 'ember-release',
+        name: 'ember-lts-3.20',
         npm: {
           devDependencies: {
-            'ember-source': await getChannelURL('release'),
+            'ember-source': '~3.20.0',
           },
         },
       },

package.json

@@ -38,13 +38,13 @@
     "@glimmer/tracking": "^1.0.1",
     "ember-auto-import": "^1.5.2",
     "ember-cli-babel": "^7.19.0",
-    "validated-changeset": "~0.10.0"
+    "validated-changeset": "~0.10.2"
   },
   "devDependencies": {
     "@ember/optional-features": "^1.0.0",
     "babel-eslint": "^10.1.0",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~3.21.0",
+    "ember-cli": "~3.22.0",
     "ember-cli-dependency-checker": "^3.1.0",
     "ember-cli-htmlbars": "^5.1.2",
     "ember-cli-inject-live-reload": "^2.0.1",

tests/integration/helpers/changeset-test.js

@@ -561,7 +561,7 @@ module('Integration | Helper | changeset', function (hooks) {
         return (isPresent(value) && value.length > 3) || 'too short';
       },
     };
-    this.set('dummyModel', { firstName: 'Jim', lastName: 'Bob' });
+    this.set('dummyModel', { firstName: 'Jimm', lastName: 'Bob' });
     this.set('validate', ({ key, newValue }) => {
       let validatorFn = validations[key];