The idea of turning dative marking into accusative marking is also reminiscent of the so-called "personal a" of Spanish, where the old dative marking of Late Latin became accusative marking for
rational direct objects (humans, gods and pets) in Old Spanish, which might be extended to other types of nouns in the future, and where indirect objects have been reinforced or modified with other elements still staying separate from direct objects.
Akangka wrote: ↑Thu Feb 28, 2019 7:10 amIn most verbs (i.e. eat, kill, beat, etc), both subject and object receive direct case. However, the subject has to be animate, while the object is inanimatized with inanimate gender. If the inanimate noun has to be the subject, passive construction is used instead. (I-DIR eat a.cake-INAM-DIR)
I wouldn't call that a passive. This is what a direct-inverse language is, so the verb would be said to be in inverse voice when it has an inanimate subject.
In a verb that is basically the causative of the transitive verb, both the old subject and the new objects is marked with direct case, but again the new subject cannot be inanimate and the old subject is inaminatized. The original object retains the case (Note that verb that have both subject and object as direct case cannot have causative form) (etc: I-DIR read him-INAM-DIR, a.book-INAM-INS) (etc: I-DIR put him-INAM-DIR, on.the.chairs-INAM-LOC)
I think I understand what you're saying here perfectly, but a lot of people here on the ZBB are going to be confused by this paragraph.

The lack of a translation in your examples may suggest a different reading, and I'm not sure if I'd really gloss that "put" verb as "put". I do understand what you mean because Mandarin 放 fang4 is used this way, meaning both "put sth somewhere" and "lie/remain placed somewhere" (with an appropriate aspect morpheme), but in general it's good if you assume your English-speaking readers are not familiar with such semantic ranges and so provide an explanation.
The rest of them (i.e. to tell, to bet etc), both subject and direct object receive direct case. However, the subject has to be animate, while the object is inanimatized. If the inanimate noun have to be the subject, passive construction is used instead. The indirect object is marked with instrumental case. (etc: I-DIR bet him-INAM-DIR, 5.dollars-INAM-INS)
Again, that would not be passive voice, that would be an example of inverse voice.