ValueError when using lazystrings in model field choices

[simon-webisoft-com]

from django.utils.translation import gettext_lazy as _
car_type = models.IntegerField(choices=((1, _('Sedan')), (2, _('Roadster'))), null=True, blank=True)

Raises exception: ValueError: Field 'car_type' expected a number but got 'S'. The 'S' comes from the label "Sedan".

The function FieldTypeGuesser.guess_format() is testing for non-string objects, if type(choice[1]) != str: and the type of this translatable string is: django.utils.functional.lazy.<locals>.__proxy__

My recommendation is test the value like so: if isinstance(choice[1], (tuple, list)):