Overlay defaults

config.yml

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

#@ def left():
key1: value1
key2: value2
#@ end

#@ def right1():
#@overlay/match missing_ok=True
name: type1
key2: value2.2
#@ end 

#@ def right2():
#@overlay/match missing_ok=True
name: type2
key1: value1.1
#@ end 

data:
  - #@ overlay.apply(left(), right1())
  - #@ overlay.apply(left(), right2())