We can get multiple posts manually in a page, but that's generated in a template, AFTER the default query returned something else (page/post, etc)
How do you query multiple posts in a public query, which share no taxonomy or anything else?
e.g. by ID:
I got it working already parsing a variable in a page-name.php template, but once it gets the template it's too late to generate e.g. canonicals.
I guess this would be something similar to a search, except the search is a 1-to-multiple-posts relation and this requires a multiple-queries-to-unique-post (each).