`/post` doesn't return string data

[hadley]

library(httr2)
local_httpbin_app <- webfakes::local_app_process(webfakes::httpbin_app())

request(local_httpbin_app$url("/post")) |>
  req_body_raw("some string") |>
  req_perform() |> 
  resp_body_json() |> 
  _$data |> 
  str()
#>  Named list()

request("https://httpbin.org/post") |>
  req_body_raw("some string") |>
  req_perform() |> 
  resp_body_json() |> 
  _$data |> 
  str()
#>  chr "some string"

^{Created on 2025-04-09 with reprex v2.1.1}