\Magento\Framework\App\Config\Value::afterLoad() method breaks specification of the overriden parent method \Magento\Framework\Model\AbstractModel::afterLoad() by not calling it, ignoring its logic, and having a different result type

[dmitrii_fediuk]

https://github.com/magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/App/Config/Value.php#L73-L81

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https://github.com/magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/Model/AbstractModel.php#L565-L576

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https://github.com/magento/magento2/issues/2665

[dmitrii_fediuk]

See also:

• The methods \Magento\Framework\App\Config\ValueInterface::getFieldsetDataValue() and \Magento\Framework\App\Config\Value::getFieldsetDataValue() are declared but never used
• The method \Magento\Framework\App\Config\ValueInterface::isValueChanged() should be removed from the interface because it is used only internally by a particular interface implementation: \Magento\Framework\App\Config\Value
• The method \Magento\Framework\App\Config\ValueInterface::getOldValue() should be removed from the interface because it is used only internally by a particular interface implementation: \Magento\Framework\App\Config\Value
• A backend model should always be a \Magento\Framework\Model\AbstractModel