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My first instinct would be to expect it to do nothing... But I guess there could be use cases where going the opposite might be useful?! 🤔 Definitely need to play around a bit with those 2.

Haven't played with it, but for me it makes sense that properties just keep doing what they're meant to. So like, if there's a negative margin, and then margin-trim was also added, both should do what they were meant to do. This way, it is visible and the dev can make adjustments.

My suspicion is that while it might be weird to discard negative leading for vertical centering use cases, not discarding it for top/bottom alignment would be *much* weirder. If you want to align a heading to an adjacent image, the intent would be that the trim edge is always respected (I think).