src/Backend/Chained.php
public function doDelete($id)
    {
        foreach ($this->backends as $backend) {
            if ($backend->doContains($id)) {
                $backend->doDelete($id);
            }
        }

        return true;
    }
public function doDelete($id)
    {
        foreach ($this->backends as $backend) {
            if ($backend->doContains($id)) {
                $backend->doDelete($id);
            }
        }

        return true;
    }
returns true even when file does not exist