[BUGFIX beta] Allow numeric keys for the get keyword

Fixes #13296

Author: duggiefresh

packages/ember-glimmer/lib/utils/references.js

@@ -127,6 +127,11 @@ export class PropertyReference extends CachedReference { // jshint ignore:line
   }
 
   get(propertyKey) {
+    if (typeof propertyKey === 'number') {
+      // Allows us to get numeric keys
+      propertyKey = '' + propertyKey;
+    }
+
     return new PropertyReference(this, propertyKey);
   }
 }

packages/ember-glimmer/tests/integration/helpers/get-test.js

@@ -51,6 +51,31 @@ moduleFor('Helpers test: {{get}}', class extends RenderingTest {
     this.assertText('[red and yellow] [red and yellow]');
   }
 
+  ['@test should be able to get an object value with numeric keys']() {
+    this.render(`{{#each indexes as |index|}}[{{get items index}}]{{/each}}`, {
+      indexes: [1, 2, 3],
+      items: {
+        1: 'First',
+        2: 'Second',
+        3: 'Third'
+      }
+    });
+
+    this.assertText('[First][Second][Third]');
+
+    this.runTask(() => this.rerender());
+
+    this.assertText('[First][Second][Third]');
+
+    this.runTask(() => set(this.context, 'items.1', 'Qux'));
+
+    this.assertText('[Qux][Second][Third]');
+
+    this.runTask(() => set(this.context, 'items', { 1: 'First', 2: 'Second', 3: 'Third' }));
+
+    this.assertText('[First][Second][Third]');
+  }
+
   ['@test should be able to get an object value with a bound/dynamic key']() {
     this.render(`[{{get colors key}}] [{{if true (get colors key)}}]`, {
       colors: { apple: 'red', banana: 'yellow' },

packages/ember-htmlbars/lib/keywords/get.js

@@ -37,6 +37,8 @@ const DynamicKeyStream = BasicStream.extend({
     let key = this.keyDep.getValue();
     if (typeof key === 'string') {
       return key;
+    } else if (typeof key === 'number') {
+      return '' + key;
     }
   },