## [0.5.1.1]
### Changed
- `Register` needs UndecidableInstances in GHC 8.6.2, I'm looking for a way around this. I've removed it for now.

## [0.5.1.0]
### Added
- The `Register` store, which allows reverse lookups for bounded enums.
  For example, if `Bool` has storage `Register (Map Bool)`, `regLookup True` will yield a list of all entities with a `True` component.
  Can also be used to emulate a hash table, where `fromEnum` is the hashing function.
  This allows us to make simple spatial hashes.
  I'm open to suggestions for better names than Register.
- `cmapIf`, cmap with a conditional test
### Changed
- `ExplInit` now too takes a monad argument.
- Started rewrite of the test suite
- Caches now internally use -2 to denote absence, to avoid possible conflict with -1 as a global entity
### Removed
- The STM instances have been removed, to be moved to their own package

## [0.5.0.0]
### Changed
- `System w a` is now a synonym for `SystemT w IO a`.
  A variable monad argument allows apecs to be run in monads like ST or STM.
  Most of the library has been rewritten to be as permissive as possible in its monad argument.
### Added
- STM stores. These will be moved to a separate package soon.

## [0.4.1.2]
### Changed
- Either can now be deleted, deleting `Either a b` is the same as deleting `(a,b)`.
- Some were missing their inline pragma's, now they don't

## [0.4.1.1]
### Changed
- Export `Get`, `Set`, `Destroy`, `Members` by default
- Export `cfold`, `cfoldM`, `cfoldM_` by default
- Fix () instance

## [0.4.1.0]
### Added
- `cfold`, `cfoldM`, `cfoldM_`
- `Either` instances and `EitherStore`

### Changed
- Changed MaybeStore implementation to no longer use -1 for missing entities.
- Fixed some outdated documentation.
- Change the `global` void entity to -2, just to be sure it won't conflict if accidentally used in a cache.

## [0.4.0.0]
### Added
- A changelog

### Changed
- `Store` is now split into 5 separate type classes; `ExplInit`, `ExplGet`, `ExplSet`, `ExplDestroy`, and `ExplMembers`.
    This makes it illegal to e.g. iterate over a `Not`.
- phantom arguments are now given as `Proxy` values, re-exported from `Data.Proxy`. This makes phantom arguments explicit and avoids undefined values.