I think it's probably better as a no-op.  Currently in my patch I just put 

    return data

You could do

    return data[::-1]

to reverse the sample, so that it came out as big endian, but if you leave it as a no-op then the data is returned in the native format for Intel Mac OS, which is the whole point of the "sowt" encoding.  Either way, the user can easily reverse the data in a `unpack` format if they want to, but in my own testing it seemed easier and simpler just to leave it in the native format. Then basically "it just works".

The patch as I've proposed it works fine on my MacOS boxes, but I have only tested it with AIFF-C files from one source.