But the author says a partial number is revealed? Edit: I just tried logging in. It's exactly as the author describes - I enter my email and get a "Log in wit

But the author says a partial number is revealed? Edit: I just tried logging in. It's exactly as the author describes - I enter my email and get a "Log in with a one-time code" page with my partial phone number. The code is sent automatically. Must be A/B testing. (No password prompt is shown unless I click "Try another way" below the code field.)