Getting a `file` response in OpenAPI v3 / python

I'm trying to define a `file` response:

responses:
  '200':
    content:
      image/png:
        schema:
          format: binary
          type: string

In the generated python code, I see that for a file type, the function __deserialize_file is called, and it's exactly what I want: it save the HTTP response body as a temporary file on the filesystem and returns its path.

The problem is that the response_type file is never defined, it's always a bytearray.

How can I tell the python wrapper generator to write a file response to a temporary file (calling __deserialize_path) ?

Thanks !