docs: static final byte[] deflate(final byte[] in, final int len) {
  		byte[] defBuf = new byte[len << 1];
  		int payloadLength;
  		synchronized (deflater) {
  			deflater.reset();
  			deflater.setInput(in, 0, len);
  			deflater.finish();
  			payloadLength = deflater.deflate(defBuf);
  		}
  		return resizeBuffer(defBuf, payloadLength);
  	}