Erratum! Emacs's dired mode (dired.el + dired-aux.el) seems to want to be able to freely add "d" as a switch to the ls switches set in dired-listing-switches. So, this:
(setq dired-listing-switches "-algGh --time-style=iso")
...is not so good. But this:
(setq dired-listing-switches "--time-style=iso -algGh")
...is more gooder.