## Next hardfork changes: - computing subtrace lengths in `FoldFSM` (for more details see [PR 138](https://github.com/fluencelabs/aquavm/pull/138)) - change `Sender` struct serialization way in `CallResult::RequestSentBy` - add a separate (empty?) state in `air_interpreter_data::CallResult` for `CallOutputValue::None` for hardening - remove serde-based field renaming in data to support outdated data versions