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This kind-of-but-not really supersedes #254. It doesn't explicitly touch on list expansion itself, however the part 2 commit implicitly doesn't force-expand last list arguments anymore by virtue of not absorbing them anymore. List expansion will require a fine-tuning pass after this change, notably the question of whether to never expand the last argument if it's a list (as done in #254), because right now it will only do so if the second-to-last argument also is a list.