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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