On trail's discussion page, kjs pointed out
that trail and album get excessive
dependencies on internal(*). I tracked this down to their (ab)use of
pagespec_match_list with the pagespec internal(*) to sort a pre-existing
list of pages.
They should just sort the pages instead; they'll already have all the
dependencies they need. My branch adds IkiWiki::sort_pages but does not
make it plugin API just yet. --smcv