Discussing the documentation on formset.get_form_kwargs()

https://docs.djangoproject.com/en/1.10/topics/forms/formsets/#passing-custom-parameters-to-formset-forms

In the documentation there is a sentence "The formset base class provides a get_form_kwargs method." 

Could you help me understand why this sentence should be illustrated with the exmple of redefinition of this method.

Then I would say this is an example of side effect in programming: it gives unpredictable result. If the form is called get_form_kwargs, then we expect that it returns what kwargs are present in the form. But this method disfigures the picture.

Well, side effect in its classical meaning (https://en.wikipedia.org/wiki/Side_effect_(computer_science))

Wouldn't just formset.get_form_kwargs(0)  be better here?

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