exceptions during __toString()

I just ran into this issue again: http://stackoverflow.com/questions/2429642/why-its-impossible-to-throw-exception-from-tostring Instead of throwing some nonsense "you're not allowed to throw from here" error-message, how about actually unwinding the stack and passing the exception to the global exception-handler? I understand there's a technical limitation making it difficult/impossible to handle exceptions during __toString() - and it looks like you can still try {...} catch (Exception $e) in __toString() just fine, but then what? You have the exception, but you have no way to pass it to the standard global exception-handler. If the script has to terminate either way, why not terminate the same way an unhandled exception would normally cause the script to terminate? E.g. output the actual error-message, or pass it to whatever was registered with register_exception_handler() so it can be output or handled in the usual way?