Quick Entry and JavaScript for Automation

I have been trying to write a small script using JavaScript for Automation that opens the quick entry panel with one inbox item. The AppleScript code for that would be

tell quick entry
  make new inbox task with properties {name: "some name"}
end tell

My guess for the correct JSA would be

OF = Application("OmniFocus")
OF.quickEntry.make({"new": OF.InboxTask, "withProperties": {"name": "some name"}})

The second line fails with an error “Can’t convert type”. Do I have the right idea about how this is supposed to work in JSA? Am I seeing some bug in the JSA implementation?