{ config, lib, ... }:
lib.my.makeSwitch {
  inherit config;
  default = true;
  optionName = "default locale settings";
  optionPath = [
    "i18n"
    "locale"
  ];
  config' = {
    i18n = {
      defaultLocale = "en_US.UTF-8";
      extraLocaleSettings = {
        LC_ADDRESS = "zh_CN.UTF-8";
        LC_IDENTIFICATION = "zh_CN.UTF-8";
        LC_MEASUREMENT = "zh_CN.UTF-8";
        LC_MONETARY = "zh_CN.UTF-8";
        LC_NAME = "zh_CN.UTF-8";
        LC_NUMERIC = "zh_CN.UTF-8";
        LC_PAPER = "zh_CN.UTF-8";
        LC_TELEPHONE = "zh_CN.UTF-8";
        LC_TIME = "zh_CN.UTF-8";
      };
    };
  };
}