Problems with class.instanceOf

[lihaochen910]

'class.instanceOf' may have problems
This is my modified version:

function class:instanceOf(clazz)
    local curClass = self.__class
    while curClass do
        if curClass == clazz then
            return true
        end
        curClass = curClass.__super
    end
    return false
end

Replace "curClass = self.__super" with "curClass = curClass.__super"