Fatal error with min_rank inside mutate with a data frame

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I am trying to practice window functions and just want to experiment with this code but my R session aborts when I run this code:

library(dplyr)
mtcars %>% 
  select(mpg, cyl) %>% 
  mutate(r = min_rank()) 

If these functions behave differently depending if context is a df or vector how should we know what they do? All the examples are for vectors... E.g. row_number()behaves differently on a data frame compared to a vector.

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