…and thus code is no longer sending _a_ message to _an_ object but using argument types to pick which function/procedure to call

I dunno. From https://en.wikipedia.org/wiki/Multiple_dispatch

"Multiple dispatch or multimethods is a feature of some programming languages in which a function or method can be dynamically dispatched based on the run-time (dynamic) type or, in the more general case, some other attribute of more than one of its arguments.[1] This is a generalization of single-dispatch polymorphism [...]"

It's just a nicer OOP to me. *shrug* But thanks.