> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 4.0.0-rc0 **`(fix):`** Rerelease 3.11.0-rc0 as a major version, with a configuration flag to disable the behavior (`use_pydantic_field_aliases`), defaulted to `true` to preserve existing behavior. **`(internal):`** The generator now shares "as is" files with Pydantic and FastAPI generators. ### What's been fixed * Rerelease 3.11.0-rc0 as a major version, with a configuration flag to disable the behavior (`use_pydantic_field_aliases`), defaulted to `false` to introduce the break on a major version. To maintain parity with pre-3.11.0 behavior, update the flag to `true`: ```yaml - name: fernapi/fern-python-sdk version: 4.0.0-rc0 config: pydantic_config: use_pydantic_field_aliases: true ```