ModelChoiceField could use a type argument

[mthuurne]

Bug report

What's wrong

When subclassing django.forms.ModelChoiceField and overriding label_from_instance(), the type of the method argument is Model, but the implementation likely needs to know which concrete model type is being passed.

How is that should be

While it is possible to work around this using cast() or assert isinstance(), having a type argument for the model type (_M) on ModelChoiceField would be a more elegant solution.

System information

• django version: 3.2.6
• django-stubs version: 1.8.0

[sobolevn]

In this case we would need to update both django-stubs (types) and django-stubs-ext (runtime __class_getattr__).