def view(request)
    form = MyForm(request.POST, instance = MyModel(myfiled = 1))
    if form.is_valid():
        obj = form.save()

but POST will NEVER merged with instance i've looked through stack:

ModelForm's save() 
https://code.djangoproject.com/browser/django/trunk/django/forms/models.py#L362

save calls:

return save_instance(self, self.instance, self._meta.fields,
                                     fail_message, commit, >>>
construct=False <<<)

BUT construct=False and in save_instance
https://code.djangoproject.com/browser/django/trunk/django/forms/models.py#L68

            if construct:
                instance = construct_instance(form, instance, fields,
exclude)

in doesn't populate instance with cleaned data

Bug or Feature?

and if it's feature, how can I set values dynamically if it's not
specified in POST

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