# Changelog
All notable changes to this crate are documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this crate adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## Unreleased

## [2.2.0-rc.1] - 2021-06-22

### Added
- `MaxEncodedLen` trait for items that have a statically known maximum encoded size. ([#268](https://github.com/paritytech/parity-scale-codec/pull/268))

## [2.1.3] - 2021-06-14

### Changed
- Lint attributes now pass through to the derived impls of `Encode`, `Decode` and `CompactAs`. PR #272

## [2.1.0] - 2021-04-06

### Fix
- Add support for custom where bounds `codec(encode_bound(T: Encode))` and `codec(decode_bound(T: Decode))` when
deriving the traits. Pr #262
- Switch to const generics for array implementations. Pr #261

## [2.0.1] - 2021-02-26

### Fix
- Fix type inference issue in `Decode` derive macro. Pr #254

## [2.0.0] - 2021-01-26

### Added
- `Decode::skip` allows to skip some encoded types. Pr #243
- `Decode::encoded_fixed_size` allows to get the fixed encoded size of a type. PR #243
- `Error` now contains a chain of causes. This full error description can also be activated on
  no std using the feature `chain-error`. PR #242
- `Encode::encoded_size` allows to get the encoded size of a type more efficiently. PR #245

### Changed
- `CompactAs::decode_from` now returns result. This allow for decoding to fail from their compact
  form.
- derive macro use literal index e.g. `#[codec(index = 15)]` instead of `#[codec(index = "15")]`
- Version of crates `bitvec` and `generic-array` is updated.
- `Encode::encode_to` now bounds the generic `W: Output + ?Sized` instead of `W: Output`.
- `Output` can now be used as a trait object.

### Removed
- `EncodeAppend::append` is removed in favor of `EncodeAppend::append_or_new`.
- `Output::push` is removed in favor of `Encode::encode_to`.
- Some bounds on `HasCompact::Type` are removed.
- `Error::what` is removed in favor of `Error::to_string` (implemented through trait `Display`).
- `Error::description` is removed in favor of `Error::to_string` (implemented through trait `Display`).