ytt example answering

README.md

This is a response to: https://stackoverflow.com/questions/75115089/ytt-append-array-items-together-but-remove-duplicates

_

doc.yaml

---
resources:
  - index: 1
  - index: 2

overlay.yaml

#@ load("@ytt:overlay", "overlay")

#@overlay/match by=overlay.all
---
#@overlay/match-child-defaults missing_ok=True
resources:
  #@overlay/match by="index"
  - index: 2
    more: True
  #@overlay/match by="index"
  - index: 3
  #@overlay/match by="index"
  - index: 4