# Pending

BREAKING CHANGES:
- [types] Header ...
- [state] Add NextValidatorSet, changes on-disk representation of state
- [state] Validator set changes are delayed by one block (!)
- [lite] Complete refactor of the package
- [rpc] `/commit` returns a `signed_header` field instead of everything being
  top-level
- [abci] Added address of the original proposer of the block to Header.
- [abci] Change ABCI Header to match Tendermint exactly
- [libs] Remove cmn.Fmt, in favor of fmt.Sprintf
- [blockchain] fix go-amino routes for blockchain messages
- [crypto] Rename AminoRoute variables to no longer be prefixed by signature type.
- [config] Replace MaxNumPeers with MaxNumInboundPeers and MaxNumOutboundPeers
- [node] NewNode now accepts a `*p2p.NodeKey`
- [crypto] Secp256k1 signature format changed from DER to `r || s`, both little endian encoded as 32 bytes.
- [crypto] Secp256k1 signature malleability removed by requiring s to be in canonical form. (See ADR 14)
- [abci] \#2159 Update use of `Validator` ala ADR-018:
    - Remove PubKey from `Validator` and introduce `ValidatorUpdate`
    - InitChain and EndBlock use ValidatorUpdate
    - Update field names and types in BeginBlock

FEATURES:
- [types] allow genesis file to have 0 validators ([#2015](https://github.com/tendermint/tendermint/issues/2015))

IMPROVEMENTS:
- [docs] Lint documentation with `write-good` and `stop-words`.
- [scripts] Added json2wal tool, which is supposed to help our users restore
  corrupted WAL files and compose test WAL files (@bradyjoestar)
- [config] Replace db_path with db_dir from automatically generated configuration files.
  Issue reported to Cosmos SDK ([#1712](https://github.com/cosmos/cosmos-sdk/issues/1712))

BUG FIXES:
- [mempool] No longer possible to fill up linked list without getting caching
  benefits [#2180](https://github.com/tendermint/tendermint/issues/2180)