New post! the NixOS "settings" option: when and how to use it:
https://zimbatm.com/notes/the-nixos-settings-option-when-and-how-to-use-it
The NixOS “settings” option: when and how to use itThe NixOS “settings” option: when and how to use itTwo years ago, @infinisil introduced RFC 0042, a new settings option to NixOS modules. Previously, to define extra settings on top of the default ones, you would use the extraConfig parameter. But it was inconvenient to use it, and sometimes the option exposed faulty behavior. This is all gone with settings, which can specify configuration files as a structural Nix value.