ARRAY-based object on top level
  __my_ref__:OOArray=ARRAY(0x123ABC)
  a
  2
ARRAY-based object, nested
  OOArray{
    a
    2
  }
ARRAY-based object, nested, including address
  OOArray=ARRAY(0x123ABC){
    a
    2
  }
HASH-based object on top level
  __my_ref__  OOHash=HASH(0x123ABC)
  2  B
  a  1
HASH-based object, nested
  {
    2  B
    a  1
  }
HASH-based object, nested, including address
  OOHash=HASH(0x123ABC){
    2  B
    a  1
  }
