KohanaPHP » Kohana v3.x

Currently the way Kohana handles exceptions is not as flexible as it could be when it comes to allowing developers to customise the this behaviour. For example some modules such as Kostache, and also core files such as Kohana_View reference `Kohana_Exception::handler()` directly (specifically for ::__toString() issues). This then enforces the need for developers to overwrite or extend Kohana_Exception directly.

I imagine a more flexible solution would be to allow developers to register exception handlers in their bootstrap as we currently do for `Log_Writer`s and `Config_Reader`s.

// Attach a handler
    Kohana::$exception_handler->attach(new Custom_Exception_Handler);

// Handle an exception using attached handler
    Kohana::$exception_handler->handle(new Kohana_Exception('Testing');

This could allow multiple handlers for exceptions although this isn't a necessity for my own usage.