Changed, increased and decreased as states

I noticed when I updated to thattrihgers and rules can now have changed, increased, and decreased in their definitions. This seems like a very powerful new addition, and definitely will let me add some new triggers. I am curious though how these can be conditions for rules, as these seem to be events, not states. After all a change is instantaneous, when if ever does the condition become false? I could see changed in the last x period of time being a state, but not changed simpliciter. Help me understand this new functionality.

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