Check on a list being used for MIDDLEWARE and INSTALLED_APPS

[bittner]

Would it make sense to check on a list being used for MIDDLEWARE and INSTALLED_APPS?

Motivation

Django originally used tuples for INSTALLED_APPS and MIDDLEWARE_CLASSES.

That's why, when projects are migrated to newer Django versions, those will remain to be tuples (even when renamed to MIDDLEWARE, for example). While this does not pose any direct problem for iterating over those values, it can be a problem when code tries to manipulate those objects. They should really be lists in modern Django code, consistently.

Real-world Examples

• Applied isort and black to project jazzband/django-analytical#180 (comment)