across() in functions: mpg

mpg |> summarize_datatypes()

## Rows: 1
## Columns: 11
## $ displ_mean              <dbl> 3.471795
## $ year_mean               <dbl> 2003.5
## $ cyl_mean                <dbl> 5.888889
## $ cty_mean                <dbl> 16.85897
## $ hwy_mean                <dbl> 23.44017
## $ manufacturer_n_distinct <int> 15
## $ model_n_distinct        <int> 38
## $ trans_n_distinct        <int> 10
## $ drv_n_distinct          <int> 3
## $ fl_n_distinct           <int> 5
## $ class_n_distinct        <int> 7