anchor.diff:      print("Row: ${v.key} ${v.value}");  // prints Row: key-1 value-1, Row: key-2 value-2, Row: key-3 value-3
     }
   
  +  // Iterate explicitly. This avoids allocation of LevelItem objects if you never call it.current.
     LevelIterator it = db.getItems(limit: 1).iterator;
     while (it.moveNext()) {
       print("${it.currentKey} ${it.currentValue}");
  
positive.code:     print("Value $value"); // Prints Key value-0, Key value-1, ...
    }
  
    // Close the db. This free's all resources associated with the db.
    db.close();
  }
  
negative.code:   // open a database at a time.
    LevelDB db = await LevelDB.open("/tmp/testdb");
  
    // By default keys and values are strings.
    db.put("abc", "def");
  
    // Now get the key
  