tests/inventory/compressed_inventory/compressed_inventory

In what ways could we deconstruct an actual inventory file so that it is less verbose and easier to understand:
Sample inventory file
[dc-1-ds]
emp23 ansible_host=172.31.20.136 ansible_password=password1 ansible_ssh_key=~/.ssh/cfrias.pem zk_observer=true
172.31.20.137 ansible_password=password1 ansible_ssh_key=~/.ssh/cfrias.pem zk_observer=true
172.31.20.138

[ds]
emp23
172.31.20.137



Possible sample compressed inventory files prepared by Paul and Maudrit:

dc-1:
     ds:
      - 172.31.20.136
      - 172.31.20.137
      - 172.31.20.138
OR

dc-1:
  ds: { 172.31.20.136, 172.31.20.137, 172.31.20.138 }