message: remove the `to_be()`, we do it manually
diff: @@ -57,7 +57,7 @@ pub mod spec {
  /// does all the job: Big Endian, bit shift and convertion
  macro_rules! byte_slice {
  ($value:ident, $shift:expr) => ({
  - ($value.to_be() >> $shift) as u8
  + ($value >> $shift) as u8
  });
  }
  