code: func GetDecompressor(namespace string, in io.Reader) (io.ReadCloser, error) {
  	if isCompressed(namespace) {
  		return zlib.NewReader(in)
  	}
  	return ioutil.NopCloser(in), nil
  }
docs: // GetDecompressor returns a fresh instance of the decompression algorithm.
  //
  // It must be closed after use.
  //
  // It is currently hardcoded to RFC 1950 (zlib).