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This adds an observable property inspired by Property from ReactiveSwift, and BehaviorSubject from RxSwift.
This implementation of the observable property has an advantage over analogs from RxSwift and ReactiveSwift because it supports defining different Access Levels to setter and getter, which is impossible to achieve in those libraries.
Aiming to maintain the philosophy of simplicity of the Signal, this implementation of the Property doesn't replicate all the functional features inherent to the FRP libraries, such as mapping the value or combining with other properties. Instead, it focuses on the observation feature only.
With this addition, the Signals would also offer a replacement for the Key-Value-Observation.