- removes cbor and instead uses streamable (https://trello.com/c/anzukjLs/901-remove-cbor)
- data types checked for payload ids and function (https://trello.com/c/4kPt98as/921-data-types-not-checked-on-payload-ids-and-function-names)
- Compressed format for messages: 1 byte for the message type / function, 2 optional bytes for the payload id
- Optimization to not fetch transactions for a block if we already have them
- RejectBlock message
- Software version sent in the handshake message (although ignored now)
- Removed mempool hack, big blocks can now be made with this codebase