title: Numpy concatenate void binary buffers
body: <p>I have a numpy array</p>
  <pre><code>a = [void(b'\x0A\x00\x01\x02'),
       void(b'\x0B\x02\x03\x04'),
       void(b'\x0C\x07\x03\x04')
      ]
  </code></pre>
  <p>I want something like
  b'\x0A\x00\x01\x02\x0B\x02\x03\x04\x0C\x07\x03\x04'</p>
  <p>Right now I am doing it using loop</p>
  <pre><code>result = bytearray()
  for b in a:
     result += bytearray(b)
  </code></pre>
  <p>Is there any numpy kind of way to do it, so that it becomes fast.</p>