Modding Discussion Difference between config.getParameter and projectile.getParameter?

This question came up in the Discord, and we realised that none of the people around knew the answer.

Obviously projectile.getParameter is only valid when running on projectiles, but if a script IS running on a projectile, then what's the difference between the two functions? config.getParameter still seems to work, but surely projectile.getParameter wouldn't exist if there wasn't a reason for it.