romainfrancois commented on pull request #8650:
URL: https://github.com/apache/arrow/pull/8650#issuecomment-787858188
In terms of the `sf` example, I get:
``` r
df_simple <- sf::read_sf(system.file("shape/nc.shp", package = "sf"))
vctrs::vec_size(df_simple$geometry)
#> [1] 100
class(df_simple$geometry)
#> [1] "sfc_MULTIPOLYGON" "sfc"
vctrs::vec_size(df_simple$geometry[[1]])
#> Error: Input must be a vector, not a `XY/MULTIPOLYGON/sfg` object.
class(df_simple$geometry[[1]])
#> [1] "XY" "MULTIPOLYGON" "sfg"
```
<sup>Created on 2021-03-01 by the [reprex
package](https://reprex.tidyverse.org) (v0.3.0)</sup>
I'm not sure this is a `vctrs` or an `sf` issue. cc @lionel- @edzer
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