$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";

##</code><code>##

Things:
  - Name: thing_1
    Sub:
      key1: value1
      key2: very very very very very very very very very very very very very very
        long line wrapped value2
key3: value3

##</code><code>##

YAML Error: Inconsistent indentation level