return value (cleaned_data) from clean() method is ignored

[krejcik]

Any changes made by model's clean method are ignored.

Sequence of calls in BaseForm.full_clean() is following:

1. - _clean_fields - which calls clean on fields and creates instance with cleaned values
2. - _clean_form - which class clean on model, assign return to form.cleaned_data but instance is not updated
3. - finally save_instance(construct=False) is called (in previous version of Django model instance was created here from correct cleaned_data)