os._exit() after logging a FATAL message

[Zooko]

I would like it if foolscap called os._exit() after it finishes durably/reliably logging a FATAL message. Note that I don't want os.abort() because that allows more Python code to run before ending the operating system process. (Alternately you might consider os.kill(os.getpid(), 9), but I don't think that works right on Windows.)