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...u merge > that data. > > So imho the combination of two factors with different levels (or even > levels in a different order) should give an error. Which R currently > doesn't throw, so I get there's room for improvement. I 100% agree with you, and is this the behaviour that vctrs used to have and dplyr currently has (at least in bind_rows()). But pragmatically, my experience with dplyr is that people find this behaviour confusing and unhelpful. And when I played the full expression of this behaviour in vctrs, I found that it forced me to think about the levels of factors m...