is this a bug? --8<---------------cut here---------------start------------->8--- > head(1:10,-3) [1] 1 2 3 4 5 6 7 > head(data.frame(a=1:5,b=5:9),-2) a b 1 1 5 2 2 6 3 3 7 > head(data.table(a=1:5,b=5:9),-2) Error in seq_len(min(n, nrow(x))) : argument must be coercible to non-negative integer Calls: head -> head.data.table --8<---------------cut here---------------end--------------->8---
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