
This option has been deprecated for a long time because is redundant (users.users.root.initialHashedPassword exists). Moreover, being of type string, it required to handle the special value "!" separately, instead of using just `null`.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.