Rule Request] Prefer new block based KVO API in Swift 3.2 or 4

When using Swift 3.2 or 4, the new block based API KVO API is preferred. // should trigger func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { } // ok

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Rule Request] Prefer new block based KVO API in Swift 3.2 or 4 · Issue #1714 · realm/SwiftLint · GitHub

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