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s.summary="Modern thread-safe and type-safe key-value observing for Swift and Objective-C."
s.description=<<-DESC
PMKVObserver provides a safe block-based wrapper around Key-Value Observing, with APIs for both Obj-C and Swift. Features include:
* Thread-safety. Observers can be registered on a different thread than KVO notifications are sent on, and can be cancelled on yet another thread. An observer can even be cancelled from two thread simultaneously.
* Automatic unregistering when the observed object deallocates.
* Support for providing an observing object that is given to the block, and automatic unregistering when this observing object deallocates. This lets you call methods on `self` without retaining it or dealing with a weak reference.
* Thread-safety for the automatic deallocation. This protects against receiving messages on another thread while the object is deallocating.
* First-class support for both Obj-C and Swift, including strong typing in the Swift API.
