Feature request: retain dplyr::distinct() ability to get unique by columns in dt_distinct() about tidytable HOT 4 CLOSED

test_df %>%
  select(c, d) %>%
  distinct()

packageVersion("tidydt")
#> ‘0.2.0’

library(tidydt)
#> 
#> Attaching package: 'tidydt'
#> The following object is masked from 'package:stats':
#> 
#>     dt

test_df <- data.table(
  a = 1:10,
  b = 11:20,
  c = c(rep("a", 6), rep("b", 4)),
  d = c(rep("a", 4), rep("b", 6))
)

dt_distinct(test_df, c, d)
#>    c d
#> 1: a a
#> 2: a b
#> 3: b b