docs: private static void deflater(InputStream in, OutputStream out, int level) {
  		final DeflaterOutputStream ios = (out instanceof DeflaterOutputStream) ? (DeflaterOutputStream) out : new DeflaterOutputStream(out, new Deflater(level, true));
  		IoUtil.copy(in, ios);
  		try {
  			ios.finish();
  		} catch (IOException e) {
  			throw new IORuntimeException(e);
  		}
  	}