Django BooleanField Checkbox Returns Empty

I read every corner of the documentation but couldn't figure out why the BooleanField Form doesn't return 'True' when the checkbox is checked. Is this a valid test? Shouldn't formset.cleaned_data = [{True}, {False}]?

>>> from django import forms
>>> from django.forms.formsets import formset_factory
>>>
>>> class CheckBox (forms.Form):
...    overwrite = forms.BooleanField (required = False)
...
>>>
>>> data = {
...     'form-TOTAL_FORMS': '2',
...     'form-INITIAL_FORMS': '0',
...     'form-MAX_NUM_FORMS': '3',
...     'checkbox-0-overwrite': True,
...     'checkbox-1-overwrite': False,
...}
>>>
>>> CheckboxFormSet = formset_factory (CheckBox)
>>> formset = CheckboxFormSet (data)
>>> formset.is_valid ()
True
>>> formset.cleaned_data
[{}, {}]
>>>

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