Following conversation here: https://kotlinlang.slack.com/archives/CJLTWPH7S/p1638968657294300

We're working on a "compose new message" screen, whose recipients box might be prefilled. We want to pass these optional recipients (e.g. contact ids) to this screen, ideally with the same format used by our server: example.com/newmessage?to=contact1&to=contact2 , using navigation library routes.

Repeated query params is a common way to pass arrays. It would be nice if navigation routes supported this pattern too. There is also a less common, but more explicit pattern of adding square brackets, e.g. to[]=me&to[]=you - this might be considered as well.