    def _allow_existing_users_default(self):
        """
        Computes the default value of allow_existing_users based on if
        allowed_users to align with original behavior not introduce a breaking
        change.
        """
        if self.allowed_users:
            return True
        return False
Computes the default value of allow_existing_users based on if
allowed_users to align with original behavior not introduce a breaking
change.
jupyterhub/auth.py