Attribute Change Event

If you have a boolean attribute set to 0. And you set the value again to 0 then the attribute change event is still fired even if it is the same value as before. That means the network will be evaluated again even if the actual value does not change. Hence a dirty bit is set whenever you set a value, it does not matter if it's the same as before. I concluded this from testing with expression node since it works based on input output concept.

edit:(23-2-10)
This feature is actually nice if you want to use an attribute as a button. i.e. you can use only one enum value and user can just click the same value to execute some kind of script or node network.