.SDcols should understand "!" as well. #1066
Description
require(data.table)
DT = data.table(x=1, y=2, z=3, a=4, b=5, c=6)
DT[, .SD, .SDcols = !c("a", "c")]
# Error in !c("a", "b") : invalid argument type{{ message }}
require(data.table)
DT = data.table(x=1, y=2, z=3, a=4, b=5, c=6)
DT[, .SD, .SDcols = !c("a", "c")]
# Error in !c("a", "b") : invalid argument type