I kind of like the Scheme way of doing it, which is to have a true and a false value, and everything besides false is truthy. All strings including the empty st

I kind of like the Scheme way of doing it, which is to have a true and a false value, and everything besides false is truthy. All strings including the empty string are true, all numbers including zero are true, all lists including the empty list are true. This makes it easy to define values as false when they are expected to be set to something else later, and you can just check the value as a condition to see if it's set or not, and then you can use it directly if it is.