Yep. The right solution here is to make latitude and longitude distinct types. The way to turn that into an even wronger solution is to create a helper just_ap

Yep. The right solution here is to make latitude and longitude distinct types. The way to turn that into an even wronger solution is to create a helper just_apply(function, lat, long) that passes the arguments to the function in the (hopefully unique) order that successfully works; so flip if needed, based on function’s type signature.