https://docs.djangoproject.com/en/4.0/ref/forms/api/#django.forms.Form.default_renderer" rel="nofollow">https://docs.djangoproject.com/en/4.0/ref/forms/api/#django.forms.Form.default_renderer * `field_order` should be a list/sequence of field names, or `None`: https://docs.djangoproject.com/en/4.0/ref/forms/api/#django.forms.Form.field_order * `cleaned_data` should be a dict/mapping of field names to values, as returned by `clean()`: https://docs.djangoproject.com/en/4.0/ref/forms/api/#django.forms.Form.cleaned_data . I similarly updated `clean()` to allow arbitrary mappings, since it may be legitimate to use some special mapping class. * `clean()` does not need to return a mapping - https://docs.djangoproject.com/en/4.0/ref/forms/validation/#validating-fields-with-clean : “If your form inherits another that doesn’t return a `cleaned_data` dictionary in its `clean()` method (doing so is optional)...” * `is_multipart` returns a `bool`: https://docs.djangoproject.com/en/4.0/ref/forms/api/#django.forms.Form.is_multipart * `hidden_fields` and `visible_fields` aren't documented, but they return lists of `BoundField` instances: https://github.com/django/django/blob/d8b437b1fbe3bf54822833bea5e19d2142cf3e1f/django/forms/forms.py#L501-L513

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