What are all the allowed `xsi:type` values in the xml's from Magento2

According to my researches, here is what I've found:

The argument interpreter is created in the lib\internal\Magento\Framework\App\ObjectManagerFactory.php :

protected function createArgumentInterpreter( \Magento\Framework\Stdlib\BooleanUtils $booleanUtils ) { $constInterpreter = new \Magento\Framework\Data\Argument\Interpreter\Constant(); $result = new \Magento\Framework\Data\Argument\Interpreter\Composite( [ 'boolean' => new \Magento\Framework\Data\Argument\Interpreter\Boolean($booleanUtils), 'string' => new \Magento\Framework\Data\Argument\Interpreter\StringUtils($booleanUtils), 'number' => new \Magento\Framework\Data\Argument\Interpreter\Number(), 'null' => new \Magento\Framework\Data\Argument\Interpreter\NullType(), 'object' => new \Magento\Framework\Data\Argument\Interpreter\DataObject($booleanUtils), 'const' => $constInterpreter, 'init_parameter' => new \Magento\Framework\App\Arguments\ArgumentInterpreter($constInterpreter), ], \Magento\Framework\ObjectManager\Config\Reader\Dom::TYPE_ATTRIBUTE ); // Add interpreters that reference the composite $result->addInterpreter('array', new \Magento\Framework\Data\Argument\Interpreter\ArrayType($result)); return $result; } 

In this code, you can clearly see that different interpreters are used based on the type attribute of the argument \Magento\Framework\ObjectManager\Config\Reader\Dom::TYPE_ATTRIBUTE:

• boolean => \Magento\Framework\Data\Argument\Interpreter\Boolean
• string => \Magento\Framework\Data\Argument\Interpreter\StringUtils
• number => \Magento\Framework\Data\Argument\Interpreter\Number
• null => \Magento\Framework\Data\Argument\Interpreter\NullType
• object => \Magento\Framework\Data\Argument\Interpreter\DataObject
• const => \Magento\Framework\Data\Argument\Interpreter\Constant
• init_parameter => \Magento\Framework\App\Arguments\ArgumentInterpreter (note that this one takes the \Magento\Framework\Data\Argument\Interpreter\Constant as parameter and not the constructor parameter)

Also an extra interpreter is added on the fly to handle array types:

• array => \Magento\Framework\Data\Argument\Interpreter\ArrayType

Note: it seems like the init_parameter type is only used in the app\code\Magento\Store\etc\di.xml to initiate some constants:

<argument name="xFrameOpt" xsi:type="init_parameter">Magento\Framework\App\Response\XFrameOptPlugin::DEPLOYMENT_CONFIG_X_FRAME_OPT</argument> ... <argument name="isCustomEntryPoint" xsi:type="init_parameter">Magento\Store\Model\Store::CUSTOM_ENTRY_POINT_PARAM</argument> ... <argument name="runMode" xsi:type="init_parameter">Magento\Store\Model\StoreManager::PARAM_RUN_TYPE</argument> <argument name="scopeCode" xsi:type="init_parameter">Magento\Store\Model\StoreManager::PARAM_RUN_CODE</argument>