ycb_requests_pr2931

what a new run launched now would send

Request with binary payload fails due to calling to_native_string
Introduced with https://github.com/kennethreitz/requests/issues/2844

```
import requests
requests.put("http://httpbin.org/put", data=u"ööö".encode("utf-8"))
```

This works with 2.8.1, but not with 2.9.

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

When you are done, leave your changes committed or in the working tree;
they are collected automatically.

Stay on this snapshot checkout (`task/ycb_requests_pr2931`). Never checkout, pull, or rebase onto `main`. That branch is a README-only orphan.
Stay on this HEAD. Do not fetch another default branch. Push only on the Cursor-created `crazy-cursor/…` side branch from this HEAD.

Some past runs of this task were launched with a different prompt (the prompt template changed since, or those runs predate this benchmark's stored prompt). Each run persists the exact prompt it sent at launch — that per-launch record is the audit trail; this page shows only the current one.