Hello,
I have a problem that DateField or DateTime fields are `str` instead of
datetime objects after the model has been instantiated/created.
But when the model is returned from the database it is a correct object.
How can I prevent this?
given:
```
class My(models.Model):
dt_obj = models.DateField("From", auto_now_add=True)
dt_str = models.DateField("From", blank=True, null=True)
```
When:
```
o = My.objects.create(dt_str="2020-01-01")
isinstance(o.dt_str, str) # True
isinstance(o.dt_obj, str) # False - is datetime
```
But after
```
o.refresh_from_db()
isinstance(o.dt_str, str) # False - is datetime
isinstance(o.dt_obj, str) # False - is datetime
```
The conclusion is that with DateField it depends on what type has been used
to create the instance.
But when the object is returned from the database it is deserialized
correctly.
This is bizarre.
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