ah, that is an interesting idea using logic operators on multiple filters but it's a lot more data intensive than for example allowing a `!` meaning "exclude"
Discussion
The feeds spec already supports set operators, it's just not built into the ui
well i would expect as a reasonable database dev you get the problem of no negations but maybe you should have been more vocal?
Oh, I do. The `difference` operator is very wasteful. But I think it's worth having the expressivity if some bulky service wants to implement it. Other implementations can either churn through resources or choose to show an error instead