vec_rbind() and names

[romainfrancois]

library(vctrs)
library(tibble)

vec_rbind(
  tibble(x = list(a = 1, b = 2)), 
  tibble(x = list(c = 3, d = 4))
)$x
#> [[1]]
#> [1] 1
#> 
#> [[2]]
#> [1] 2
#> 
#> [[3]]
#> [1] 3
#> 
#> [[4]]
#> [1] 4

vec_rbind(
  tibble(x = c(a = 1, b = 2)), 
  tibble(x = c(c = 3, d = 4))
)$x
#> [1] 1 2 3 4

underlying issue to tidyverse/dplyr#4446