Cases and prepositions both signify into which 'slot' of a verb this object goes. From that perspective, if prepositional objects correspond to keyword args, so

Cases and prepositions both signify into which 'slot' of a verb this object goes. From that perspective, if prepositional objects correspond to keyword args, so do cases. On the other hand, a case is a form of the noun-phrase which can be constructed without looking at the predicate. I see a similarity to the address operator in C: foo(bla, &blub) means that bla is passed in value-case, whereas blub is passed in reference-case.