<commit_before># Change Log
All notable changes to this project will be documented in this file.

---
## Master

* Adds `scan(into:accumulator:)`.
* Adds `queuePriority` parameter (defaults to `.normal`) to `OperationQueueScheduler`.
* Performance enhancement reduces Bag dispatch inline code size by 12%.

#### Anomalies

## [4.2.0](https://github.com/ReactiveX/RxSwift/releases/tag/4.2.0)

* Adds Smart Key Path subscripting to create a binder for property of object.
* Adds `UICollectionView` extensions:
    * `prefetchItems`
    * cancelPrefetchingForItems
* Adds `UITableView` extensions:
    * `prefetchRows`
    * `cancelPrefetchingForRows`
* Fixes various spelling mistakes and missing parameters.
* Adds `UISegmentedControlExtensions`:
    * `titleForSegment(at:)`
    * `imageForSegment(at:)`
* Adds `Maybe.ifEmpty(default:)` operator.
* Adds `Maybe.ifEmpty(switchTo:)` operator.
* Adds `Maybe.catchErrorJustReturn(_:)` operator.
* Add  `Single.flatMapMaybe(_:)` operator.
* Add  `Single.flatMapCompletable(_:)` operator.
* Add  `Single.zip(_:)` operator.
* Add  `Single.catchErrorJustReturn(_:)` operator.
* Add  `Single.asMaybe(_:)` operator.
* Add  `Single.asCompletable(_:)` operator.
* Fixes unused parameter in `UIControl+Rx`

#### Anomalies

* Lower macOS Deployment Target to 10.9
* Deprecates `UISegmentedControl.enabled(forSegmentAt:)` in favor of `UISegmentedControl.enabledForSegment(at:)`.

## [4.1.2](https://github.com/ReactiveX/RxSwift/releases/tag/4.1.2)

* Adds deprecation warner.

#### Anomalies

* Fixes ambiguity issue with  `Single.do(onNext:onError:onSubscribe:onSubscribed:onDispose:)` and `Single.do(onSuccess:onError:onSubscribe:onSubscribed:onDispose:)`.

## [4.1.1](https://github.com/ReactiveX/RxSwift/releases/tag/4.1.1)

#### Anomalies

* Fixes compilation issue with  Xcode 9.1.<commit_msg>Update changelog<commit_after># Change Log
All notable changes to this project will be documented in this file.

---
## Master

* Adds `scan(into:accumulator:)`.
* Adds `queuePriority` parameter (defaults to `.normal`) to `OperationQueueScheduler`.
* Performance enhancement reduces Bag dispatch inline code size by 12%.

#### Anomalies

## [4.2.0](https://github.com/ReactiveX/RxSwift/releases/tag/4.2.0)

* Adds Smart Key Path subscripting to create a binder for property of object.
* Adds `UICollectionView` extensions:
    * `prefetchItems`
    * cancelPrefetchingForItems
* Adds `UITableView` extensions:
    * `prefetchRows`
    * `cancelPrefetchingForRows`
* Fixes various spelling mistakes and missing parameters.
* Adds `UISegmentedControlExtensions`:
    * `titleForSegment(at:)`
    * `imageForSegment(at:)`
* Adds `Maybe.ifEmpty(default:)` operator.
* Adds `Maybe.ifEmpty(switchTo:)` operator.
* Adds `Maybe.catchErrorJustReturn(_:)` operator.
* Add  `Single.flatMapMaybe(_:)` operator.
* Add  `Single.flatMapCompletable(_:)` operator.
* Add  `Single.zip(_:)` operator.
* Add  `Single.catchErrorJustReturn(_:)` operator.
* Add  `Single.asMaybe(_:)` operator.
* Add  `Single.asCompletable(_:)` operator.
* Use `editingEvents` argument in `controlPropertyWithDefaultEvents`.

#### Anomalies

* Lower macOS Deployment Target to 10.9
* Deprecates `UISegmentedControl.enabled(forSegmentAt:)` in favor of `UISegmentedControl.enabledForSegment(at:)`.

## [4.1.2](https://github.com/ReactiveX/RxSwift/releases/tag/4.1.2)

* Adds deprecation warner.

#### Anomalies

* Fixes ambiguity issue with  `Single.do(onNext:onError:onSubscribe:onSubscribed:onDispose:)` and `Single.do(onSuccess:onError:onSubscribe:onSubscribed:onDispose:)`.

## [4.1.1](https://github.com/ReactiveX/RxSwift/releases/tag/4.1.1)

#### Anomalies

* Fixes compilation issue with  Xcode 9.1.
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{'dir': 'git-commits-cleaned', 'id': '168025', 'n_tokens_mistral': 1315, 'n_tokens_neox': 1222, 'n_words': 274}