In the following .I seems not to be within group.
> dt <- data.table(a = 1:4, b = 1:2)
> dt[, .I, by = b]
b .I
1: 1 1
2: 1 3
3: 2 2
4: 2 4
> packageVersion("data.table")
[1] '1.9.3'
This seems contrary to ?data.table.
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