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Changes between Initial Version and Version 1 of Ticket #15602, comment 12

initial	v1
1		I've done some additional research, and the problem actually goes much deeper than this. Not only do the results of `get_readonly_fields` get passed to the `InlineAdminFormSet` object and others in `django.contrib.admin.helpers` that actually mark the individual field objects as readonly and render them differently, they also get passed into the ~~regular form~~ validation logic.
	1	I've done some additional research, and the problem actually goes much deeper than this. Not only do the results of `get_readonly_fields` get passed to the `InlineAdminFormSet` object and others in `django.contrib.admin.helpers` that actually mark the individual field objects as readonly and render them differently, they also get passed into the formset validation logic.
2	2
3	3	The way formsets work is to take a single form class and instantiate it multiple times; an inline model formset uses a constructed `ModelForm` subclass. (see `django.forms.models.modelformset_factory`)