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fintersect and fsetdiff handle column scope conflicts better #7435

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scopingIssues related to variable scoping
@jangorecki

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@jangorecki

Change added in#5256 is not optimal, using verbose = T shows why.

> z[, a := rowidv(.z), env=list(.z = z), verbose=T]Argument 'j' after substitute: `:=`(a, rowidv(structure(list(a = c(1, 1), b = 2:3), row.names = c(NA, -2L), class = c("data.table", "data.frame"), .internal.selfref = <pointer: 0x5590368f0190>)))

Better will be to simply useset()

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