`mutate` does not report dropped variables about tidylog HOT 2 CLOSED

require(tidyverse)
#> Loading required package: tidyverse
starwars %>%
 select(name, height, mass, homeworld) %>%
 tidylog::mutate(
  mass = NULL,
  height = height * 0.0328084 # convert to feet
)
#> mutate: dropped one variable (mass)
#> mutate: converted 'height' from integer to double (0 new NA)
#> # A tibble: 87 × 3
#>    name               height homeworld
#>    <chr>               <dbl> <chr>    
#>  1 Luke Skywalker       5.64 Tatooine 
#>  2 C-3PO                5.48 Tatooine 
#>  3 R2-D2                3.15 Naboo    
#>  4 Darth Vader          6.63 Tatooine 
#>  5 Leia Organa          4.92 Alderaan 
#>  6 Owen Lars            5.84 Tatooine 
#>  7 Beru Whitesun lars   5.41 Tatooine 
#>  8 R5-D4                3.18 Tatooine 
#>  9 Biggs Darklighter    6.00 Tatooine 
#> 10 Obi-Wan Kenobi       5.97 Stewjon  
#> # … with 77 more rows