paleolimbot opened a new pull request, #35954:
URL: https://github.com/apache/arrow/pull/35954

   This wasn't necessarily a regression (reprex fails in 12.0.0 as well), 
although the comments suggest that assigning a named character vector will work 
when assigning schema metadata and this feature appears to be used by at least 
one of our dependencies (sfarrow). Given that the sfarrow check passes on 
12.0.0, there is possibly also a place in our code that returns a named 
character vector rather than a list. I've confirmed that this fix solves the 
reverse dependency failure building the sfarrow example vignette.
   
   ``` r
   library(arrow, warn.conflicts = FALSE)
   
   schema <- schema(x = int32())
   schema$metadata <- c("name" = "value")
   schema$metadata
   #> $name
   #> [1] "value"
   ```
   
   <sup>Created on 2023-06-06 with [reprex 
v2.0.2](https://reprex.tidyverse.org)</sup>


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