is.double(as.integer64(1))
as.integer64(1):9
match(as.integer64(2), as.integer64(0:3))
as.integer64(2) %in% as.integer64(0:3)
unique(as.integer64(c(1,1,2)))
rank(as.integer64(c(1,1,2)))
order(as.integer64(c(1,NA,2)))
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