lib: _: rec {
  my = import ./my.nix lib;

  dns = import ./dns.nix lib;

  isEven = number:
    assert (builtins.isInt number) || (builtins.isFloat number);
      builtins.div number 2 == 0;

  isOdd = !isEven;

  pow = base: exponent:
    assert (builtins.isInt base) && (builtins.isInt exponent);
    assert exponent > 0;
      builtins.foldl' (x: _: x * base) 1 (builtins.genList _ exponent);

  comcat = lib.concatStringsSep ",";

  mkTcpMem = min: ini: max: (lib.concatMapStrings (x: toString x + " ") [(pow 2 min) (pow 2 ini) (pow 2 max)]);
}