The way the ErrorHandler is loaded in Framework\App\Bootstrap probably prevents interception on the ErrorHandler class. Reason I would like to use this, is to adjust the ErrorHandler in a more developer friendly version (Whoops).
It makes sense, as the error handler needs to be registered before the object manager will be loaded. But, it would be great if there is a method to register another error_handler after that is done.
So basically it would be:
Register default Magento error handler
Load object manager
Register default Magento error handler again using object manager
The second moment would allow for interception I believe. Or, am I overseeing a method to register a different error_handler?