| abstract protected _set ( mixed $data = null, mixed $offset = null, array $options = [] ) : object | ||
| $data | mixed | An array or an `Entity` object to set. |
| $offset | mixed | The offset. If offset is `null` data is simply appended to the set. |
| $options | array | Any additional options to pass to the `Entity`'s constructor. |
| return | object | Returns the inserted `Record`, `Document` object or other `Entity` object. |
protected abstract function _set($data = null, $offset = null, $options = array());