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combine() is deprecated in favour of vctrs::vec_c(). combine() attempted to automatically guess whether you wanted c() or unlist(), but could fail in surprising ways. We now believe it's better to be explicit.
combine()
vctrs::vec_c()
c()
unlist()
combine(...)
Vectors to combine.
f1 <- factor("a") f2 <- factor("b") combine(f1, f2) # -> vctrs::vec_c(f1, f1) combine(list(f1, f2)) # -> vctrs::vec_c(!!!list(f1, f2))
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