slice_max() doesn't work with character column

[mgirlich]

library(dplyr, warn.conflicts = FALSE)
library(dtplyr)

dt <- lazy_dt(data.frame(x = c("b", "a", "d", "c")))
dt %>% slice_max(x) %>% pull(x)
#> Error: invalid argument to unary operator

^{Created on 2021-03-05 by the reprex package (v1.0.0)}