Oh good point, I hadn't considered vararg promotion!

Do you know if casting to a function also make objc_msgSend_stret and objc_msgSend_fpret unnecessary? I haven't yet worked with any methods that return structs or floating point values, so I haven't had to deal with them yet.

Edit: Oh, nope, my bad, objc_msgSend_stret is the one where you definitely have to cast: http://blog.lazerwalker.com/blog/2013/10/12/the-objective-c-...