code: public function offsetUnset($offset)
      {
          $this->retrieve();
          $this->deletedDatas[] = $this->updatedDatas[$offset];
          if (isset($this->updatedDatas[$offset])) {
              unset($this->updatedDatas[$offset]);
          }
  
          return $this;
      }
docs: @param mixed $offset
  
  @return $this