For "match", it needs to be an expression for some things so that means wrapping it in a function and returning the result. In the future I'm going to do some optimisation to see if the expression is the last in a function and remove the wrapper. For example:

    return (function() {
        if(b instanceof True) {
            return ifTrue;
        } else if(b instanceof False) {
            return ifFalse;
        }
    })();

Can just become:

    if(b instanceof True) {
        return ifTrue;
    } else if(b instanceof False) {
        return ifFalse;
    }

The output of `with` is pretty gross. Definitely want to hear ideas on how to clean it up :)