code: public JSONArray element( Collection value, JsonConfig jsonConfig ) {
        if( value instanceof JSONArray ){
           elements.add( value );
           return this;
        }else{
           return element( _fromCollection( value, jsonConfig ) );
        }
     }
docs: Append a value in the JSONArray, where the value will be a JSONArray which
  is produced from a Collection.
  
  @param value A Collection value.
  @return this.