InMemoryUploadedFile no `encoding` Attribute

I've had a bit of an issue with InMemoryUploadedFile instances that come in request.FILES to a view. I passed one of them to another constructor to initialise it, and then I tried to access the `encoding` attribute (which appears in the help() for the class). I followed the class hierarchy and found that it leads to FileProxyMixin, where the `encoding` attribute is defined. This is where my mind is blown though:

  def __init__(self, f, *args, **kwargs):      print type(f) # => <class 'django.core.files.uploadedfile.InMemoryUploadedFile'>      print type(f.encoding) # => AttributeError: 'cStringIO.StringO' object has no attribute 'encoding'

How can it in the first line claim that it is an InMemoryUploadedFile, but in the second line, where I try to access an attribute on it, claim to be a StringO? To test that this issue is not the result of the instance being passed too far into my code (where my code messes something up), I tried the same test in the view directly with the request.FILES['file'] instance, and the same issue occurs. I should be able to continue without this attribute, but now I'm just curious. If anyone knows what's going on, please let me know. Thanks.

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