"RecursionError" happens when `jsonable_encoder` is used inside path operation function

[amirsoroush]

Sometimes it's preferable to return JSONResponse directly. To ensure the returning object is jsonable, jsonable_encoder() should be used. When doing so, RecursionError: maximum recursion depth exceeded happens.

Here is a simple code to reproduce:

from dataclasses import dataclass
from typing import Literal
from fastapi import FastAPI
from fastapi.encoders import jsonable_encoder
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from richapi.exc_parser.handler import add_exc_handler
from richapi.exc_parser.openapi import enrich_openapi
from richapi.exc_parser.protocol import RichHTTPException


@dataclass
class NShouldNotBeTen(RichHTTPException):
    message: Literal["N should not be 10"] = "N should not be 10"
    status_code = 403

class NWrapper(BaseModel):
    value: int

app = FastAPI()
app.openapi = enrich_openapi(app)
add_exc_handler(app)

@app.get("/{n}", response_model=NWrapper)
async def index(n: int) -> JSONResponse:
    if n == 10:
        raise NShouldNotBeTen
    return JSONResponse(content=jsonable_encoder(NWrapper(value=n)))

curl -X "GET" "http://127.0.0.1:8000/20" works fine but the swagger UI (http://127.0.0.1:8000/docs) won't be rendered as it cannot generate openapi.json, and it raises the aforementioned exception.