---
Hash (message='My circular hashes'):
  Hash#size: 1
  Hash#default: 
  Hash#default_proc: 
  Pair 0:
    Key:
      Symbol:
        Symbol#to_s: foo
        Symbol#size: 3
        Symbol#encoding: !ruby/encoding US-ASCII
    Value:
      Hash:
        Hash#size: 1
        Hash#default: 
        Hash#default_proc: 
        Pair 0:
          Key:
            Symbol:
              Symbol#to_s: bar
              Symbol#size: 3
              Symbol#encoding: !ruby/encoding US-ASCII
          Value: Hash {:foo=>{:bar=>{...}}}