Nothing
library(codelist)
source("helpers.R")
x <- code(factor(c("A", "B", NA)))
res <- rep(x, 2)
expect_equal(res, code(factor(c("A", "B", NA, "A", "B", NA))))
x <- code(factor(character(0), levels = c("A", "B")))
res <- rep(x, 2)
expect_equal(res, x)
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