Decimal value allowed for auto primary key

If I have the following model...

class FruitType(models.Model):
  name = models.CharField(max_length=255)

And I insert some records...

FruitType.objects.create(name="Apple")
FruitType.objects.create(name="Orange")

Why is this valid?

FruitType.objects.get(id=1.2) # Gets me the apple
FruitType.objects.get(id=2.9) # Gets me the apple

Django seems to truncate the id to just the integer part.
This also applies to form validation:

class FruitForm(forms.Form):
  type = forms.ModelChoiceField(queryset=FruitType.objects.all())

form = FruitForm(data={'type': 1.5})
form.is_valid() # returns True

Is there any way to prevent this? I.e., I want my form to treat 1.5 as invalid input and raise a ValidationError.

Thank you.

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