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Kubernetes resources are stored as json internally, in etcd. Things like the specific yaml formatting aren't guaranteed to be retained when round-tripping. The actual value is the same, it's just how it's presented that differs.

“|” “|-” “|+” “>” different

config: |
  "hello"
# Json 格式：{"config": "hello\n"}  
  
config: |-
  "hello"
# Json 格式：{"config": "hello"}  

config: |+
  "hello"