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I'll start with the last question in your post: I was also wondering if there are any theoretical proofs/explanations about reward/Q-value clipping and which one being better. I highly doubt there will be any such theoretical work. The problem is that these variants of clipping (clipping rewards and clipping $Q$ values) fundamentally modify the task / ...

I will disagree slightly with @mico. There is a usage of "additive rewards" that refers to decomposable reward functions (e.g. my reward in selling an item I do not want to own is composed of the reward of not having an unwanted item anymore, plus the monetary gain in selling the item). But, there is indeed a fundamental relation between additive and ...