Observable without `this` should not fail silently

[compulim]

Version: core-js@3.19.2

When SubscriberFunction.next is executed without this, it will fail silently.

In the following code (CodeSandbox), only 1 and 3 is observed.

import Observable from "core-js/features/observable";

const observer = new Observable((observer) => {
  const { next } = observer;

  observer.next(1); // Will reach subscriber
  next(2);          // Will not reach subscriber, and fail silently
  observer.next(3); // Will reach subscriber
});

observer.subscribe({
  next: (value) => console.log(value)
});

In the console log:

1
3

I believe when calling next(2), it should be either:

• Fail with exception
• Succeed/observed (this is bound)

[zloirock]

Thanks, you are right.