fix: Parse.Object.get returns array instead of object if key name is number-like

integration/test/ParseObjectTest.js

@@ -2056,6 +2056,39 @@ describe('Parse Object', () => {
     expect(obj.get('string')).toBeInstanceOf(String);
   });
 
+  fit('returns correct field values', async () => {
+    const values = [
+      // { field: 'string', value: 'string' },
+      // { field: 'number', value: 1 },
+      // { field: 'boolean', value: true },
+      // { field: 'array', value: [1, 2, 3] },
+      // { field: 'object', value: { key: 'value' } },
+      // { field: 'object', value: { key1: 'value1', key2: 'value2' } },
+      // { field: 'object', value: { key1: 1, key2: 2 } },
+      { field: 'object', value: { '1x1': 1 } },
+      { field: 'object', value: { '1': 1 } },
+      // { field: 'date', value: new Date() },
+      // {
+      //   field: 'file',
+      //   value: Parse.File.fromJSON({
+      //     __type: 'File',
+      //     name: 'name',
+      //     url: 'http://localhost:1337/parse/files/integration/name',
+      //   }),
+      // },
+      // { field: 'geoPoint', value: new Parse.GeoPoint(40, -30) },
+      // { field: 'bytes', value: { __type: 'Bytes', base64: 'ZnJveW8=' } },
+    ];
+    for (const value of values) {
+      const object = new TestObject();
+      object.set(value.field, value.value);
+      await object.save();
+      const query = new Parse.Query(TestObject);
+      const objectAgain = await query.get(object.id);
+      expect(objectAgain.get(value.field)).toEqual(value.value);
+    }
+  });
+
   describe('allowCustomObjectId', () => {
     it('can save without setting an objectId', async () => {
       await reconfigureServer({ allowCustomObjectId: true });

src/ObjectStateMutations.ts

@@ -191,7 +191,7 @@ export function commitServerChanges(
       typeof val === 'object' &&
       !Array.isArray(val) &&
       Object.keys(val).length > 0 &&
-      Object.keys(val).some(k => !isNaN(parseInt(k))) &&
+      Object.keys(val).some(k => k === String(Number(k)) && Number.isInteger(Number(k))) &&
       !['sentPerUTCOffset', 'failedPerUTCOffset'].includes(attr)
     ) {
       val = Object.values(val);