django/django — pull request #2317 by YDS19872712 (2014-02-18 11:26:13+00:00)
Title: Update uploadedfile.py

I see no reason for content_type_extra to be required in TemporaryUploadedFile and InMemoryUploadedFile. As it breaks old code that creates InMemoryUploadedFile manually.
In my case i generate and image and wrap it in InMemoryUploadedFile and i think it is more rational not to require content_type_extra, than to pass None in most cases.