unable to save ModelForm with primary key change

Hi,

I'm trying to modify a model instance, specifically the field which is
the model's primary key. When I save, nothing seems to happen.
Everything in cleaned_data is good, but the model is not updated. No
exception is thrown, the field isn't updated, nothing.

All I'm doing is

form = MyForm(request.POST, instance=model_instance)
if form.is_valid():
form.save()

I'm thinking that this might be an issue with respect to how sqlite
handles changes to primary key fields. Perhaps I'm handling the change
incorrectly. Help appreciated.

Using Django 1.4.1 with python-sqlite2 2.6.3 and 3.6.20.

Thanks,
Mike

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