title: Does the firebase user uid change if the user is signed out of the app when using email authentication?
body: <p>I have to implement firebase email authentication and want to store data with a field of firebaseUser.uid in that. I want to know if there is any case when the user's uid will be changed so that I don't mess up with the user data as I will be referring it based on the user's uid. So if any user signs up using an email id, it's uid should never change unless he logs in again with a different email.</p>