How to pass an object-path over d-bus from emacs?

[Fran Burstall (Gmail)]

I am using the excellent dbus.el library.

Q: How do I feed a parameter of type o (object-path) over d-bus from
emacs-lisp?

My reading of the docs is that something of the form

    (list :variant (list :object-path "/some/path/here"))

should do the job.  But the receiving application complains:

   playerctl-WARNING **: 20:10:52.843: mpris:trackid is a string, not a
D-Bus object reference

Any idea what I am missing?

---Fran