Queries Are Always Case-Insensitive

[pasetti]

If I try to change the name or the domain of a spec_item by changing the case of one of its letters, I get an error. The error is triggered by this check:

        # Verify that, in edit mode, if the domain:name has been modified, it is unique within non-deleted, 
        # non-obsolete spec_items in the project and in the default ValSet
        if (self.mode == 'edit') and (('name' in self.changed_data) or ('domain' in self.changed_data)):
            if SpecItem.objects.exclude(status='DEL').exclude(status='OBS').filter(project_id=self.project.id, \
                         domain=cd['domain'], name=cd['name'], val_set_id=default_val_set_id).exists():
                raise forms.ValidationError('Edit Error: Domain:Name pair already exists in this project')

As far as I can tell, this means that the query is case-insensitive. However, as far as I can tell from the Django documentation, the query should be case-sensitive by default. Am I missing something?