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  $out = "Things:\n  - Name: thing_1\n    Sub:\n      key1: value1\n  
+    key2: very very very very very very very very very very very very
+ very very\n        long line wrapped value2\nkey3: value3\n";

Things:
  - Name: thing_1
...
      key2: very very very very very very very very very very very ver
+y very very
        long line wrapped value2
key3: value3

YAML Error: Inconsistent indentation level