paleolimbot commented on PR #14647:
URL: https://github.com/apache/arrow/pull/14647#issuecomment-1315636721

   We already do `substr()` (which maps to the `utf8_slice_codeunits()` 
function...this doesn't work on a string type).
   
   Fun discovery in the process, though:
   
   ``` r
   substr(list(as.raw(1:5)), 1, 100)
   #> [1] "as.raw(c(0x01, 0x02, 0x03, 0x04, 0x05))"
   ```


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