Cog predict fails to parse output `cog.Path`

[arthur-presti]

During cog predict, a BasePredictor.predict() that returns a list[cog.Path] triggers a TypeError, most likely due to a byte object being passed to urllib.parse.unquote_plus (instead of str).

The underlying Predictor implementation runs fine locally, but fails when called by cog predict.

Tested on python 3.11 and 3.12 with both cog 0.15.9 and 0.16.6.

Full error log:

Traceback (most recent call last):
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/uvicorn/protocols/http/httptools_impl.py\", line 409, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/uvicorn/middleware/proxy_headers.py\", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/fastapi/applications.py\", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/applications.py\", line 112, in __call__
    await self.middleware_stack(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/middleware/errors.py\", line 187, in __call__
    raise exc
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/middleware/errors.py\", line 165, in __call__
    await self.app(scope, receive, _send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/middleware/exceptions.py\", line 62, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/_exception_handler.py\", line 53, in wrapped_app
    raise exc
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/_exception_handler.py\", line 42, in wrapped_app
    await app(scope, receive, sender)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/routing.py\", line 714, in __call__
    await self.middleware_stack(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/routing.py\", line 734, in app
    await route.handle(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/routing.py\", line 288, in handle
    await self.app(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/routing.py\", line 76, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/_exception_handler.py\", line 53, in wrapped_app
    raise exc
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/_exception_handler.py\", line 42, in wrapped_app
    await app(scope, receive, sender)
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/starlette/routing.py\", line 73, in app
    response = await f(request)
               ^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/fastapi/routing.py\", line 301, in app
    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/fastapi/routing.py\", line 212, in run_endpoint_function
    return await dependant.call(**values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/cog/server/http.py\", line 385, in predict
    return await _predict(
           ^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/cog/server/http.py\", line 492, in _predict
    _ = response_type(**response_object)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/pydantic/main.py\", line 253, in __init__
    validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/cog/types.py\", line 210, in validate
    filename=get_filename(value),
             ^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/site-packages/cog/types.py\", line 410, in get_filename
    basename = urllib.parse.unquote_plus(basename)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/root/.pyenv/versions/3.11.13/lib/python3.11/urllib/parse.py\", line 824, in unquote_plus
    string = string.replace('+', ' ')
             ^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: a bytes-like object is required, not 'str'