src/Colorium/Stateful/Provider/Native.php
public function get($key, $fallback = null)
    {
        return $this->has($key)
            ? $_SESSION[$this->root][$key]
            : $fallback;
    }
public function get($key, $fallback = null)
    {
        return $this->has($key)
            ? $_SESSION[$this->root][$key]
            : $fallback;
    }
Get value in session

@param string $key
@param mixed $fallback
@return mixed