!!org.yaml.snakeyaml.issues.issue73.Blog
labels: !!set {Java: null, SnakeYAML: null, YAML: null}
name: Test Me!
numbers: !!set {19: null, 17: null}
posts: !!set
  ? {text: text 1, title: Title1}
  : null
  ? {text: text text 2, title: Title2}
  : null