### openapi-fetch version ^0.14.1 ### Description Code <img width="300" alt="Image" src="https://github.com/user-attachments/assets/b4d091e6-aa35-4d63-977f-548415ba4f47" /> Console <img width="300" alt="Image" src="https://github.com/user-attachments/assets/5540f50a-4b80-4bed-9fb7-02936c8e0dd4" /> ### Reproduction `undefined` ### Expected result The string is already stringified - don't use `JSON.stringify` when `typeof body === 'string'`. ### Extra - [x] I’m willing to open a PR (see [CONTRIBUTING.md](https://github.com/openapi-ts/openapi-typescript/blob/main/packages/openapi-fetch/CONTRIBUTING.md)) - [x] PR: https://github.com/openapi-ts/openapi-typescript/pull/2556