RxSwift: SwitchLatest Operator

.switchLatest { }

• Emits values from the most recent Observable and the unsubscribes from the previous emitting Observable.
• Unsubscribes from previous Observable when a new Observable is emitted from the source Observable, not when the new Observable emits an element. (i.e. The last X below will not be emitted.)

-------------------------------->
---X----X-X---X----------------->
|||||||||||||---Y------Y-----Y-->

`switchLatest`

---X----X-X-----Y------Y-----Y-->

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