Incompatible types in assignment

Describe the bug
Mypy throws an error if I try to assign value to a model field.

To Reproduce

class MyModel(tortoise.Model):
    ...
    my_field = fields.BooleanField(default=False)

m = await MyModel.get(id=...)
m.deleted = True
await m.save()

>>> Mypy error: Incompatible types in assignment (expression has type "bool", variable has type "BooleanField") 

Expected behavior
No mypy errors =)

Additional context
In django there is a similar problem and I should disable type check entirely or use django-stubs.

Tortoise, on the other hand, uses typing module heavily. Is there something that I can use to avoid such errors?

Start by reproducing the MyModel example with a BooleanField assignment and running mypy. Investigate how model fields are typed and exposed to instances. Done means valid assignments such as m.deleted = True produce no mypy error while the model can still be saved.