numpy.fromfile OSError: first argument must be an open file (Python 3)

Using Python 3 and Numpy 1.9.2 there is an issue with numpy.fromfile when called on an existing file object. This code works fine in Python 2.7.

$ fh
<_io.FileIO name=8 mode='rb+'>
$ np.fromfile(fh, dtype=dtype, count=length)
OSError: first argument must be an open file

I've checked fh.closed is False, so the file is still open. The error is thrown by numpy.multiarraymodule.c#2119.

Someone mentioned these issues on Stack Overflow, but no clear solutions are present.

Any suggestions?

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