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cached 0.9.0

Generic cache implementations and simplified function memoization
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# Changelog

## [Unreleased]
## Added

## Changed

## Removed

## [0.9.0]
## Added

## Changed
- Replace SizedCache implementation to avoid O(n) lookup on cache-get
- Update to Rust-2018 edition
- cargo fmt everything

## Removed


## [0.8.1]
## Added

## Changed
- Replace inner cache when "clearing" unbounded cache

## Removed


## [0.8.0]
## Added

## Changed
- Switch to `once_cell`. Library users no longer need to import `lazy_static`

## Removed

## [0.7.0]
## Added
- Add `cache_clear` and `cache_result` to `Cached` trait
  - Allows for defeating cache entries if desired

## Changed

## Removed

## [0.6.2]
## Added

## Changed
- Update documentation
  - Note the in-memory nature of cache stores
  - Note the behavior of memoized functions under concurrent access

## Removed

## [0.6.1]
## Added

## Changed
- Fixed duplicate key eviction in `SizedCache::cache_set`. This would manifest when
  `cached` functions called with duplicate keys would race set an uncached key,
  or if `SizedCache` was used directly.

## Removed

## [0.6.0]
## Added
- Add `cached_result` and `cached_key_result` to allow the caching of success for a function that returns `Result`.
- Add `cached_control` macro to allow specifying functionality
  at key points of the macro

## [0.5.0]
## Added
- Add `cached_key` macro to allow defining the caching key

## Changed
- Tweak `cached` macro syntax
- Update readme

## Removed


## [0.4.4]
## Added

## Changed
- Update trait docs

## Removed


## [0.4.3]
## Added

## Changed
- Update readme
- Update examples
- Update crate documentation and examples

## Removed