Segment-Airship Integration Setup: Confusion in the Docs

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From this section: https://segment.com/docs/destinations/airship/#requirements

Docs say "you must implement Named Users in Airship," but it's unclear to me how this is done.

When I look up how it's done, I see https://support.airship.com/hc/en-us/articles/360012434371-Step-7-Named-User which lists as an example:

>iOS 
>UAirship.namedUser().identifier = "NamedUserID" 
>Android 
>UAirship.shared().getNamedUser().setId("NamedUserID");

This looks like it's saying "in order to implement, call the identify() method on the Airship SDK". I would have expected Segment to implement calling identify on our behalf.

In other places, I see eg here: "https://docs.airship.com/partners/segment/#tag-group", they say "To properly feed events into and associate events with Segment profiles, named_user_id properties must map to Segment profile userId properties." but they similarly give no indication for how this mapping is done.

Again, I would have expected that this mapping is just the sort of thing Segment does automatically.

Can you help me integrate Airship & Segment?