Make the serializer JSON independent to further comply with "clean architecture"

[Createdd]

See file here

See the discussion on this issue on Slack

Right now the Response is JSON dependent (end of the file):

return Response(
        json.dumps(response.value, cls=ser.ArxivDocEncoder),
        mimetype="application/json",
        status=STATUS_CODES[response.type],
    )

[Createdd]

One way to let objects interact is to use composition. This can be a good way to decouple functions. See this article to fresh up the ideas of delegation in OOP in Python

[liadmagen]

I would also add this source for how to refactor python properly

[liadmagen]

And regarding the serialization method itself, json is quite slow. ujson is already faster, and there are also other alternatives in the benchmark competition