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## [v0.16.1] - 2021-04-17
[v0.16.1]: https://github.com/egonSchiele/contracts.ruby/compare/v0.16.0...v0.16.1
- Enhancement: Pretty-print contracts in error messages - [Corey Farwell](https://github.com/frewsxcv) [#289](https://github.com/egonSchiele/contracts.ruby/pull/289)
- Bugfix: Fix `attr_accessor_with_contract` with multiple attribute names input - [Kevin Yeh](https://github.com/kyeah) [#259](https://github.com/egonSchiele/contracts.ruby/pull/259)
- Bugfix: Fix "stack level too deep" in CI builds - [md-work](https://github.com/md-work) [#283](https://github.com/egonSchiele/contracts.ruby/pull/283)
## [v0.16.0] - 2017-04-24
[v0.16.0]: https://github.com/egonSchiele/contracts.ruby/compare/v0.15.0...v0.16.0
- **Support for Ruby 1.8 has been discontinued** - [Corey Farwell](https://github.com/frewsxcv) [#256](https://github.com/egonSchiele/contracts.ruby/pull/256)
- Enhancement: Add a `Contracts::Attrs` module containing attribute w/ contracts utilities - [Corey Farwell](https://github.com/frewsxcv) [#255](https://github.com/egonSchiele/contracts.ruby/pull/255)
- Bugfix: Fix StrictHash contract for extra keys - [Maciej Malecki](https://github.com/smt116) [#254](https://github.com/egonSchiele/contracts.ruby/pull/254)
## [v0.15.0] - 2017-02-24
[v0.15.0]: https://github.com/egonSchiele/contracts.ruby/compare/v0.14.0...v0.15.0
- Bugfix: Func contract's return value isn't enforced with blocks - [Piotr Szmielew](https://github.com/esse) [#251](https://github.com/egonSchiele/contracts.ruby/pull/251)
- Bugfx: Fix contracts used in AR-models - [Gert Goet](https://github.com/eval) [#237](https://github.com/egonSchiele/contracts.ruby/pull/237)
## [v0.14.0] - 2016-04-26
[v0.14.0]: https://github.com/egonSchiele/contracts.ruby/compare/v0.13.0...v0.14.0
- Enhancement: Add StrictHash contract - [Fyodor](https://github.com/cbrwizard) [#236](https://github.com/egonSchiele/contracts.ruby/pull/236)
- Bugfix: dont fail if something other than a hash is passed to a KeywordArgs - [Dan Padilha](https://github.com/dpad) [#234](https://github.com/egonSchiele/contracts.ruby/pull/234)
- LICENSE ADDED: Simplified BSD (same as what is specified in the readme) - [Charles Dale](https://github.com/chuckd) [#233](https://github.com/egonSchiele/contracts.ruby/pull/233)
- Bugfix: fix constant looking when including a module that includes contracts (requires removing the check to see if contracts is already included) - [Aditya Bhargava](https://github.com/egonSchiele) [#232](https://github.com/egonSchiele/contracts.ruby/pull/232)
- Bugfix for err case when KeywordArgs and Proc are used together - [Aditya Bhargava](https://github.com/egonSchiele) [#230](https://github.com/egonSchiele/contracts.ruby/pull/230)
- Enhancement: Add DescendantOf contract - [Miguel Palhas](https://github.com/naps62) [#227](https://github.com/egonSchiele/contracts.ruby/pull/227)
## [v0.13.0] - 2016-01-25
[v0.13.0]: https://github.com/egonSchiele/contracts.ruby/compare/v0.12.0...v0.13.0
- Enhancement: Add support for Ruby 2.3 - [Oleksii Fedorov](https://github.com/waterlink) [#216](https://github.com/egonSchiele/contracts.ruby/pull/216)
- Enhancement: Added Int, Nat and NatPos builtin contracts - [Simon George](https://github.com/sfcgeorge) [#212](https://github.com/egonSchiele/contracts.ruby/pull/212)
- Bugfix: Allow contracts on singleton of subclass - [Oleksii Federov](https://github.com/waterlink) [#211](https://github.com/egonSchiele/contracts.ruby/pull/211)
## [v0.12.0] - 2015-09-15
[v0.12.0]: https://github.com/egonSchiele/contracts.ruby/compare/v0.11.0...v0.12.0
- Feature: add `Regexp` validator - [Gert Goet](https://github.com/eval) [#196](https://github.com/egonSchiele/contracts.ruby/pull/196)
- Docs: bootstrap cucumber/aruba/relish setup - [Oleksii Fedorov](https://github.com/waterlink) [#195](https://github.com/egonSchiele/contracts.ruby/pull/195)
- Bugfix: allow to `extend` module, that has `Contracts` or `Contracts::Core` included without harming current module/class `Contracts` functionality, see: [#176](https://github.com/egonSchiele/contracts.ruby/issues/176) - [Oleksii Fedorov](https://github.com/waterlink) [#198](https://github.com/egonSchiele/contracts.ruby/pull/198)
- Enhancement: add `include Contracts::Builtin` to allow users to use builtin contracts without `Contracts::` prefix together with `include Contracts::Core` - [PikachuEXE](https://github.com/PikachuEXE) [#199](https://github.com/egonSchiele/contracts.ruby/pull/199)
## [v0.11.0] - 2015-07-30
[v0.11.0]: https://github.com/egonSchiele/contracts.ruby/compare/v0.10.1...v0.11.0
- Enhancement: add `include Contracts::Core` that doesn't pollute the namespace as much as `include Contracts` - [Oleksii Federov](https://github.com/waterlink) [#185](https://github.com/egonSchiele/contracts.ruby/pull/185)
- Bugfix: fail if a non-hash is provided to a `HashOf` contract - [Abe Voelker](https://github.com/abevoelker) [#190](https://github.com/egonSchiele/contracts.ruby/pull/190)
- Bugfix: bugfix for using varargs and `Maybe[Proc]` together - [Adit Bhargava](https://github.com/egonSchiele) [#188](https://github.com/egonSchiele/contracts.ruby/pull/188)
- Bugfix: make KeywordArgs fail if unexpected keys are passed in - [Abe Voelker](https://github.com/abevoelker) [#187](https://github.com/egonSchiele/contracts.ruby/pull/187)
- Feature: range contract added - [Oleksii Fedorov](https://github.com/waterlink) [#184](https://github.com/egonSchiele/contracts.ruby/pull/184)
- Feature: enum contract added - [Dennis Günnewig](https://github.com/dg-ratiodata) [#181](https://github.com/egonSchiele/contracts.ruby/pull/181)
## [v0.10.1] - 2015-07-16
[v0.10.1]: https://github.com/egonSchiele/contracts.ruby/compare/v0.10...v0.10.1
- Enhancement: make `@pattern_match` instance variable not render ruby warning. Required to use new aruba versions in rspec tests - [Dennis Günnewig](https://github.com/dg-ratiodata) [#179](https://github.com/egonSchiele/contracts.ruby/pull/179)
## [v0.10] - 2015-07-07
[v0.10]: https://github.com/egonSchiele/contracts.ruby/compare/v0.9...v0.10
- Bugfix: make `Maybe[Proc]` work correctly - [Simon George](https://github.com/sfcgeorge) [#142](https://github.com/egonSchiele/contracts.ruby/pull/142)
- Bugfix: make `Func` contract verified when used as return contract - [Rob Rosenbaum](https://github.com/robnormal) [#145](https://github.com/egonSchiele/contracts.ruby/pull/145)
- Bugfix: make `Pos`, `Neg` and `Nat` contracts handle non-numeric values correctly - [Matt Griffin](https://github.com/betamatt) and [Gavin Sinclair](https://github.com/gsinclair) [#147](https://github.com/egonSchiele/contracts.ruby/pull/147) [#173](https://github.com/egonSchiele/contracts.ruby/pull/173)
- Enhancement: reduce user class pollution through introduction of contracts engine - [Oleksii Fedorov](https://github.com/waterlink) [#141](https://github.com/egonSchiele/contracts.ruby/pull/141)
- Feature: add builtin `KeywordArgs` and `Optional` contracts for keyword arguments handling - [Oleksii Fedorov](https://github.com/waterlink) [#151](https://github.com/egonSchiele/contracts.ruby/pull/151)
- Feature: recognize module as a class contract - [Oleksii Fedorov](https://github.com/waterlink) [#153](https://github.com/egonSchiele/contracts.ruby/pull/153)
- Feature: custom validators with `Contract.override_validator` - [Oleksii Fedorov](https://github.com/waterlink) [#159](https://github.com/egonSchiele/contracts.ruby/pull/159)
- Feature: add builtin `RangeOf[...]` contract - [Gavin Sinclair](https://github.com/gsinclair) [#171](https://github.com/egonSchiele/contracts.ruby/pull/171)
## [v0.9] - 2015-04-24
[v0.9]: https://github.com/egonSchiele/contracts.ruby/compare/0.8...v0.9
- MAJOR fix in pattern-matching: If the return contract for a pattern-matched function fails, it should NOT try the next pattern-match function. Pattern-matching is only for params, not return values.
- raise an error if multiple defns have the same contract for pattern matching.
- New syntax for functions with no input params (the old style still works)
Old way:
```ruby
Contract nil => 1
def one
```
New way:
```
Contract 1
def one
```
- Prettier HashOf contract can now be written like this: `HashOf[Num => String]`
- Add `SetOf` contract
- various small fixes
## v0.8 - 2015-04-03
- code refactored (very slight loss of performance, big increase in readability)
- fail when defining a contract on a module without `include Contracts::Modules`
- fixed several bugs in argument parsing, functions with complex params get contracts applied correctly now.
- added rubocop to ci.
- if a contract is set on a protected method, it should not become public.
- fixed pattern matching when the multiple definitions of functions have different arities.
- couple of new built-in contracts: Nat, Eq.
- changed `Invariant` to `invariant`: `invariant(:day) { 1 <= day && day <= 31 }`
- prettier error messages (`Contracts::Num` is now just `Num`, for example)
- support for yard-contracts
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