code: public static MessageUnpacker newDefaultUnpacker(byte[] contents, int offset, int length)
      {
          return DEFAULT_UNPACKER_CONFIG.newUnpacker(contents, offset, length);
      }
docs: Creates an unpacker that deserializes objects from subarray of a specified byte array.
  <p>
  This method provides an optimized implementation of <code>newDefaultUnpacker(new ByteArrayInputStream(contents, offset, length))</code>.
  <p>
  This method is equivalent to <code>DEFAULT_UNPACKER_CONFIG.newDefaultUnpacker(contents)</code>.
  
  @param contents The byte array that contains packed objects
  @param offset The index of the first byte
  @param length The number of bytes
  @return A new MessageUnpacker instance that will never throw IOException