[12:30:35] <A_smart_kitten>	 NovemLinguae: if it's okay i'm inclined to re-rename T409283, as it's not just PHP8.4 _CI_ that MW installation fails for (and i'm slightly worried that the new title might imply that it is) :)
[12:30:36] <stashbot>	 T409283: Parsoid fails PHP 8.4 CI during MW installation with 'Error: Class "Wikimedia\Parsoid\DOM\HTMLDocument" not found' - https://phabricator.wikimedia.org/T409283
[12:31:40] <NovemLinguae>	 sure go ahead. i figured the installer wasn't broken, just CI, but sounds like that's not correct
[12:34:23] <A_smart_kitten>	 yeah, it also breaks when actually installing MW on PHP8.4+ unfortunately :/
[12:35:16] <A_smart_kitten>	 (T412499 was a duplicate task filed from a third-party MW user's perspective FWIW)
[12:35:17] <stashbot>	 T412499: GUI (web) installer for 1.45.1 throws error - https://phabricator.wikimedia.org/T412499
[12:39:05] <A_smart_kitten>	 "it also breaks when actually installing MW on PHP8.4+" -- that is, it breaks when `mediawiki/vendor` is used (which I believe it is for the downloads provided at https://www.mediawiki.org/wiki/Download), or when authoritative class maps are enabled for Composer in another way.