range_sortna(c(0L, 1L, NA, 2L))
range_sortna(c(2L, NA, 1L, 0L))
range_sortna(c(0L, 1L, NA, 2L), na.last=TRUE)
range_sortna(c(2L, NA, 1L, 0L), na.last=TRUE)
range_sortna(c(0L, 1L, NA, 2L), na.last=FALSE)
range_sortna(c(2L, NA, 1L, 0L), na.last=FALSE)
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