Hiera merge behavior for arrays of hashes

It would be handy if the Hiera merge behavior documentation covered merging arrays of hashes. For example, what is the result of the following using a “unique” merge?

# a.yaml

people:

  - name: Alice

    password: rKlXG1WwsmpSWwkXkN

# b.yaml

people:

  - name: Daniel

    password: hunter2

https://puppet.com/docs/puppet/6.1/hiera_merging.html#merge-behaviors

I'm filing this in DOCUMENTS with my community account since my last day at Puppet will be 1/31/2019