mypy issues for python 3.10

[foarsitter]

Running the most recent mypy with 3.10 is giving some typing errors.

mypy: commands[0]> mypy model_utils tests
  model_utils/managers.py:200: error: Unused "type: ignore" comment 
  [unused-ignore]
      class InheritanceQuerySet(InheritanceQuerySetMixin[ModelT], QuerySet[M...
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...
  tests/models.py:113: error: MonitorField is nullable but its generic get type
  parameter is not optional  [misc]
          name_changed_nullable = MonitorField(monitor="name", null=True)
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:11: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              SoftDeletable.available_objects.create(name='a', is_removed=Tr...
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:12: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              SoftDeletable.available_objects.create(name='b', is_removed=Fa...
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...
  tests/test_models/test_softdeletable_model.py:17: error: "SoftDeletableModel"
  has no attribute "name"  [attr-defined]
              self.assertEqual(queryset[0].name, 'b')
                               ^~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:20: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              instance = SoftDeletable.available_objects.create(name='a')
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:28: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              SoftDeletable.available_objects.create(name='a')
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:36: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              obj = SoftDeletable.available_objects.create(name='a')
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:41: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              instance = SoftDeletable.available_objects.create(name='a')
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:49: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              instance = SoftDeletable.available_objects.create(name='a')
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:58: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              SoftDeletable.available_objects.create(name='a')
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:59: error: Unexpected attribute
  "name" for model "SoftDeletableModel"  [misc]
              SoftDeletable.available_objects.create(name='b')
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_models/test_softdeletable_model.py:61: error: Cannot resolve keyword
  'name' into field. Choices are: is_removed  [misc]
              result = SoftDeletable.available_objects.filter(name="a").dele...
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_managers/test_inheritance_manager.py:514: error: Unexpected
  attribute "other_onetoone" for model "InheritanceManagerTestParent"  [misc]
              child4 = InheritanceManagerTestChild4.objects.create(related=s...
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...
  tests/test_managers/test_inheritance_manager.py:524: error:
  "InheritanceManagerTestParent" has no attribute "id__count"  [attr-defined]
              self.assertEqual(qs.get(id=self.child1.id).id__count, 1)
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  tests/test_managers/test_inheritance_manager.py:534: error:
  "InheritanceManagerTestParent" has no attribute "id__count"  [attr-defined]
              self.assertEqual(qs.get(id=self.child1.id).id__count, 1)

[foarsitter]

@mthuurne can we use your expert knowledge here?