APPEND_DATA: malformed JSON

[se38]

If you create the JSON document with CREATE_DATA and append a structure with APPEND_DATA, the resulting JSON is malformed (two objects instead of one).

Wrong

{ 
  "f1": "v1", 
  "f2": "v2" 
}, 
"newstructure": { 
  "f3": "v2" 
}

Correct:

{ 
  "f1": "v1", 
  "f2": "v2" ,
  "newstructure": { 
    "f3": "v2" 
  }
}