Task.Request should accept type[Request], not just str

[alessio-b2c2]

Description

Task.Request is currently typed as str:

# celery-stubs/app/task.pyi
Request: str

However, celery's own source code and documentation indicate it accepts either a string (dotted path) or a class:

# celery/app/task.py
#: Request class used, or the qualified name of one.
Request = 'celery.worker.request:Request'

Assigning a Request subclass directly is a common and documented pattern:

from celery import Task
from celery.worker.request import Request

class MyRequest(Request):
    ...

class MyTask(Task):
    Request = MyRequest  # type error: Incompatible types in assignment

Expected type

Request: str | type[Request]

Versions

• celery-types: 0.26.0
• celery: 5.6.x
• mypy: 1.15.0