> df <- tibble(x = 1, y = tibble(a = 2), z = tibble(a = 3))
> df %>% unpack(c(y, z))
Error: Names must be unique.

> df %>% unpack(c(y, z), names_repair = "unique")
Message: New names:
* a -> a...2
* a -> a...3

# A tibble: 1 x 3
      x a...2 a...3
  <dbl> <dbl> <dbl>
1     1     2     3

> df %>% unpack(c(y, z), names_repair = "minimal")
# A tibble: 1 x 3
      x     a     a
  <dbl> <dbl> <dbl>
1     1     2     3

