If you shouldn't use non-booleans in an if statement, then why is it allowed? If it's allowed, it should behave in the way that would surprise developers the le

If you shouldn't use non-booleans in an if statement, then why is it allowed? If it's allowed, it should behave in the way that would surprise developers the least. http://en.wikipedia.org/wiki/Principle_of_least_astonishment http://en.wikipedia.org/wiki/Principle_of_least_astonishment