check_type() should list offending variables

[EmilHvitfeldt]

you see that something was wrong, but it doesn't list which variables were bad. I think we could same people some time by being more informative here

library(recipes)

data("ames", package = "modeldata")

recipe(Sale_Price ~ ., data = ames) |>
  step_dummy(starts_with("Lot_")) |>
  prep() |>
  bake()
#> Error in `step_dummy()`:
#> Caused by error in `prep()`:
#> ! All columns selected for the step should be string, factor, or ordered.

ames |>
  select(starts_with("Lot_")) |>
  glimpse()
#> Rows: 2,930
#> Columns: 4
#> $ Lot_Frontage <dbl> 141, 80, 81, 93, 74, 78, 41, 43, 39, 60, 75, 0, 63, 85, 0…
#> $ Lot_Area     <int> 31770, 11622, 14267, 11160, 13830, 9978, 4920, 5005, 5389…
#> $ Lot_Shape    <fct> Slightly_Irregular, Regular, Slightly_Irregular, Regular,…
#> $ Lot_Config   <fct> Corner, Inside, Corner, Corner, Inside, Inside, Inside, I…

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