Problems testing observables that emit arrays or objects with other observables.

Bug Report

Current Behavior
When using expectObservable to check an observable that emits and object with some observable the test fails.

Expected behavior
The test should pass.

Reproduction
That can be 100% reproduced using the code below.

• REPL or Repo link:
  https://replit.com/@fcostarodrigo/testSchedulerHighOrderObservables#index.test.js

const highOrderObj = of({ a: of('a') });

it('generate the stream correctly', () => {
  testScheduler.run(({ cold, expectObservable }) => {
    expectObservable(highOrderObj).toBe('(a|)', { a: { a: cold('(a|)') } });
  });
});

Environment

• Runtime: node v12.22.1
• RxJS version: 6.6.7

Start with the reproduction in index.test.js on the linked Replit project and inspect the expectObservable and TestScheduler behavior shown there. Confirm how emitted objects containing observables are compared, then run the reproduction to verify that the expectation passes for the provided high-order object case.