Nothing
Code
dt_level(c("D", "M", "Y"))
Condition
Error in `dt_level()`:
! Argument `level` must be a scalar of class <character>, but is length 3
Code
dt_level("d")
Condition
Error in `dt_level()`:
! Argument `level` must be equal to one of "n", "D", "M", or "Y".
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