Use publish->{$post->post_type}?

[janboddez]

We currently use transition_post_status because it runs for every post type, then return early if the post type is not supported. Going for a more specific hook (we could foreach() over the supported post types array) may reduce this overhead.

Will require some of the (very few) tests to be rewritten.

[janboddez]

Like, we can't use save_post to save the checkbox value before publish_post is run, because it runs after. (save_post is run pretty much at the very end.)

We could use transition_post_status to save the checkbox value, and publish_post, which runs almost immediately after, to toot (or not). But what's the benefit, other than not attaching the second callback when we save as draft? What's the actual gain?