Boost caching 404 for Services module

When I create page callback with Services module and return status code 404, Boost caches page anyway.

There is a problem, that Services ends page processing logic with function exit(), so Boost don't stores proper information about status code into variable $_boost['menu_item']['status'] (boost_deliver_html_page, which fills $_boost['menu_item']['status'] properly is not called in this case) and in boost_exit function it thinks, that status code is 200;