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sort(data.table(a=3:1))
# Error in `[.data.table`(x, , by, drop = F) :
# j (the 2nd argument inside [...]) is a single symbol but column name 'by' is not found. Perhaps you intended DT[,..by] or DT[,by,with=FALSE]. This difference to data.frame is deliberate and explained in FAQ 1.1.
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