as.bitwhich(c(0L, 1L, 2L, -2L, NA))
as.bitwhich(c(0, 1, 2, -2, NA))
as.bitwhich(c(NA, NA, NA))
as.bitwhich(c(FALSE, FALSE, FALSE))
as.bitwhich(c(FALSE, FALSE, TRUE))
as.bitwhich(c(FALSE, TRUE, TRUE))
as.bitwhich(c(TRUE, TRUE, TRUE))
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