A short follow-up to my review above: the installcheck-world suites that could not run in my environment before have now been run as well, on a build of the same patched tree with plperl, uuid-ossp (OSSP library) and injection points enabled.
All of them pass: bool_plperl, hstore_plperl, jsonb_plperl and uuid-ossp, and the gin, hash, nbtree, typcache and injection_points module suites, plus the injection_points isolation specs (18/18). So installcheck-world is now fully green with the patch: main regression 239/239, isolation 134/134, contrib 51/51 suites, test modules 40/40 suites. (As with the testing in my review, this was done with AI assistance.)
