Aliasing ForeignKey fields return integer value, not object

[MikiSoft]

Assuming that Relationship consists of from_person and to_person fields, here's an simple example:

>> results = Relationship.objects.all().annotate(target=F('to_person'))
>> results[0].from_person
<User: second>
>> results[0].target
3

So, it doesn't work as expected. It should just rename the field, not convert it to the integer type.
The same happens with complex annotations when using conditional expressions (i.e. Case statements). I've even tried like this:

.annotate(
        person= \
                Case( \
                        When( \
                                to_person__in=friends, \
                                then=F('to_person') \
                        ), \
                        default=F('from_person'),  \
                        output_field=ForeignKey('User') \
                ), \
        target= \
                Case( \
                        When( \
                                to_person__in=friends, \
                                then=F('from_person') \
                        ), \
                        default=F('to_person'), \
                        output_field=ForeignKey('User') \
                ) \
)

But it still doesn't work. So that's the reason why I think that this is a bug, as I haven't found any explanation for this behavior nor any solution.