openai-python: Uploading JSON to Files API returns invalid file format

Upload to the files endpoint with a JSON file throws an error

Code:

from openai import OpenAI

client = OpenAI()
file = client.files.create(
    file=open("example_1.json", "rb"),
    # Can either be fine-tuned or assistant
    purpose="assistants",
)

Stacktrace:

ile [~/anaconda3/lib/python3.10/site-packages/openai/resources/files.py:88](https://file+.vscode-resource.vscode-cdn.net/Users/vashishtmadhavan/Documents/playground/~/anaconda3/lib/python3.10/site-packages/openai/resources/files.py:88), in Files.create(self, file, purpose, extra_headers, extra_query, extra_body, timeout)
     82 if files:
     83     # It should be noted that the actual Content-Type header that will be
     84     # sent to the server will contain a `boundary` parameter, e.g.
     85     # multipart/form-data; boundary=---abc--
     86     extra_headers = {"Content-Type": "multipart/form-data", **(extra_headers or {})}
---> 88 return self._post(
     89     "[/files](https://file+.vscode-resource.vscode-cdn.net/files)",
     90     body=maybe_transform(body, file_create_params.FileCreateParams),
     91     files=files,
     92     options=make_request_options(
     93         extra_headers=extra_headers, extra_query=extra_query, extra_body=extra_body, timeout=timeout
     94     ),
     95     cast_to=FileObject,
     96 )

File [~/anaconda3/lib/python3.10/site-packages/openai/_base_client.py:1055](https://file+.vscode-resource.vscode-cdn.net/Users/vashishtmadhavan/Documents/playground/~/anaconda3/lib/python3.10/site-packages/openai/_base_client.py:1055), in SyncAPIClient.post(self, path, cast_to, body, options, files, stream, stream_cls)
   1041 def post(
   1042     self,
   1043     path: str,
   (...)
   1050     stream_cls: type[_StreamT] | None = None,
   1051 ) -> ResponseT | _StreamT:
   1052     opts = FinalRequestOptions.construct(
   1053         method="post", url=path, json_data=body, files=to_httpx_files(files), **options
   1054     )
-> 1055     return cast(ResponseT, self.request(cast_to, opts, stream=stream, stream_cls=stream_cls))

File [~/anaconda3/lib/python3.10/site-packages/openai/_base_client.py:834](https://file+.vscode-resource.vscode-cdn.net/Users/vashishtmadhavan/Documents/playground/~/anaconda3/lib/python3.10/site-packages/openai/_base_client.py:834), in SyncAPIClient.request(self, cast_to, options, remaining_retries, stream, stream_cls)
    825 def request(
    826     self,
    827     cast_to: Type[ResponseT],
   (...)
    832     stream_cls: type[_StreamT] | None = None,
    833 ) -> ResponseT | _StreamT:
--> 834     return self._request(
    835         cast_to=cast_to,
    836         options=options,
    837         stream=stream,
    838         stream_cls=stream_cls,
    839         remaining_retries=remaining_retries,
    840     )

File [~/anaconda3/lib/python3.10/site-packages/openai/_base_client.py:877](https://file+.vscode-resource.vscode-cdn.net/Users/vashishtmadhavan/Documents/playground/~/anaconda3/lib/python3.10/site-packages/openai/_base_client.py:877), in SyncAPIClient._request(self, cast_to, options, remaining_retries, stream, stream_cls)
    874     # If the response is streamed then we need to explicitly read the response
    875     # to completion before attempting to access the response text.
    876     err.response.read()
--> 877     raise self._make_status_error_from_response(err.response) from None
    878 except httpx.TimeoutException as err:
    879     if retries > 0:

BadRequestError: Error code: 400 - {'error': {'message': "Invalid file format. Supported formats: ['c', 'cpp', 'csv', 'docx', 'html', 'java', 'json', 'md', 'pdf', 'php', 'pptx', 'py', 'rb', 'tex', 'txt', 'css', 'jpeg', 'jpg', 'js', 'gif', 'png', 'tar', 'ts', 'xlsx', 'xml', 'zip']", 'type': 'invalid_request_error', 'param': None, 'code': None}}

Here is the example file: example_1.json