Like in one example of another pack author I see him using small_hitbox (I guess it's the same as "small") and custom hitbox, 2-2-1, and in another of his items he doesn't use it but with a hitbox of 1-1-1. Like this is very confusing to me. When I put an item in-game with the /iahitbox turned on I don't see any difference if it's "small" or "big" on the hitbox, I only see a difference in it's original size if I don't tweak the settings in blockbench.
Please can someone explain this to me, or polish the wiki page so it's not overly vague.