https://github.com/domnikl/DesignPatternsPHP/blob/5f5649b57ea94471e20b54eb439c6368dea07886/Structural/Registry/Registry.php#L30-L37
https://github.com/domnikl/DesignPatternsPHP/blob/5f5649b57ea94471e20b54eb439c6368dea07886/Structural/Registry/Registry.php#L44-L51
