2021
https://www.haskellforall.com/2021/01/dynamic-type-errors-lack-relevance.html

let
  pkgs = import <nixpkgs> { };
  enable = option: "${option}=true";
  disable = option: "${option}=false";
in
  pkgs.lib.cli.toGNUCommandLine { }
    { option = [ "max-jobs=5" "cores=4" enable "fallback" ]; }

# The intention was to produce this result:
    [ "--option" "max-jobs=5" "--option" "cores=4" "--option" "fallback=true" ]