Hi,
I'm was seeing some parts of the code and I found that in every "write"is 
called the _interop.as_array function changing a list or similar toa byte 
array. But if I pass a byte array, it change in a new! Seems that isnot 
efficient (but maybe array.array knows that and returns the same).
Would be good add something like this:
def as_array(data=None):    if data is None:        return array.array('B')
    elif isinstance(data, array.array) and data.typecode == 'B':        return 
data
    try:        return array.array('B', data)    except TypeError:        .....
Regards!
Alan                                      
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